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SpongeBob SquarePants is a popular cartoon, and has been referenced in popular culture numerous times. Several of these references are from other Nickelodeon shows and shows from other networks.
The Adventures of Jimmy Neutron: Boy Genius
In the episode "Operation: Rescue Jet Fusion", Jimmy, Carl, and Sheen go into the ocean to look for a tracking device, and when they find it, a pineapple can be seen at the mid-right. A commercial stated that the pineapple was SpongeBob's house.
In "The Box," Darwin says that an empty box could be anything through a kid's eyes in the same way that in "Idiot Box," SpongeBob and Patrick use an empty box and their imagination to make their own adventures.
Gumball's analogy, In the Episode "The Pony" "finding a piece of hay in a needle stack," may be a reference to the episode, "Prehibernation Week" where SpongeBob and Sandy played that exact game. Both are based on the idiom "finding a needle in a haystack," which is used to describe something that is hard to locate.
While trapped on the rooftop in the Episode "The Slap", Gumball and Tobias lay down on top of each other in the hot sun, continuously flip each other over, and leave prints of their bodies. Referencing the episode "Home Sweet Pineapple", where SpongeBob pours green paint on the front of his body, red paint on his back, and flips his body along a picket fence, leaving prints.
In "The Promise" When Darwin says "We're gonna play 'till we're purple!", he's making a reference to The SpongeBob SquarePants Movie, in which SpongeBob said "We're gonna party 'till we're purple!
In "The Photo" Sussie turning the lights to "night" and "day" may be poking fun at "New Student Starfish" where Patrick turned the lights to "death" and "life."
In "The Mustache" The song "Because We're Men" is a parody of the song "Now That We're Men" from the 2004 Nickelodeon movie The SpongeBob SquarePants Movie.
In "The Dream" Gumball finding a pineapple in his locker and water coming out of it is a reference to SpongeBob's House.
In "The Check" The invisible cars in this episode are a similar idea to the Invisible Boat Mobile.
In the episode "A Smith in the Hand," after Stan announced his new station Clean TV, in one scene, several kids can be seen crying to their mother with one of them saying "Where's SpongeBob?" and another saying "I want Patrick!"
In "Toy Whorey," an angry banana shaped SpongeBob toy is seen.
In "Scents and Sensei-bility," an orange SpongeBob piñata is seen.
In one episode named "The Last Last One Forever And Ever," a live-action episode, Meatwad (who is portrayed as a yoga ball) is helping Master Shake (who is portrayed as a human named "Don Shake") write a story, and suggests writing a story about "A sponge who lives in a pineapple under the sea." Shake says "Hasn't that already been done?" and Meatwad replies "No. I don't think so."
In the episode "Shake Like Me," Meatwad says he wants a SpongeBob bounce house.
In part one of the first season finale, Master Pakku coyly stated to one of his students, "Nice work... a couple more years and you might be ready to fight a sea sponge." The show's creators later said in the audio commentary of Siege of the North Part I that his statement was a friendly poke at SpongeBob SquarePants.
In the episode, "The Earworm Reverberation," Sheldon is trying to think of a song that he can't remember, so he's trying to guess songs off the top of his head, and one of the songs he thinks about is the "SpongeBob SquarePants Theme Song," and even sings the first line.
In the episode, "The Justice League Recombination," Zack says that a starfish was killed and came back to life, to which Sheldon replies, "Was it wearing shorts? Because it was probably Nickelodeon." It's a reference to Patrick Star and the shorts he wears.
In the episode "The Separation Oscillation," Howard says "I'd like to SpongeBob her SquarePants."
In the episode, "The Locomotion Reverberation," Raj and Stuart are left to watch Halley, who is Howard and Bernadette's baby daughter. After talking on the phone with them and hearing how incompetent they seem, Bernadette moans "I may have just left my infant daughter with Patrick and SpongeBob."
In the episode "The Long Distance Dissonance," Sheldon can be seen watching the episode "Plankton!" on his phone.
In the episode "Thursday" a poster of SpongeBob's face can be seen hanging on the wall in Josie Trent's and Corrine Baxter's dorm on Josie's side of the room. It is most noticeable during the scene where Josie is dancing to her radio.
In the episode, "The Word," Jack says the N word, which gets him expelled. When Diane asks "How was home," Jack replies "SpongeBob was Great."
The episode "Caillou's Crossword" is similar to "Sailor Mouth".
In the episode "The Ballad of Johnny Sardine," Johnny Elaine can be seen on a magazine.
The Creative Pet Grooming Show 2013
When a woman walks into a room, the SpongeBob theme can be heard.
The Daily Show
In the May 2, 2011 episode, Jon Stewart jokes that Osama bin Laden now "lives in a pineapple under the sea," showing a picture of him sitting on Conch Street.
In the April 23, 2015 episode, Jon Stewart says "Dear God, SpongeBob, what have they done to you?" upon seeing the NSA's recycling mascot.
In the May 28, 2015 episode, the "lives in a pineapple under a sea" quote is used again, this time to refer to Bernie Sanders.
In Dan Vs, there is a character named "Spy Boss" who is Elise's boss. He usually speaks to Elise through a computer which has a very simmilar appearance to Karen Plankton, Plankton's computer wife.
In "The Vampires of Venice," Rory insults an alien species called the Saturnyn, and uses the word SpongeBob.
Wooldoor Sockbat is a parody of SpongeBob, spoofed also with Stimpy (from The Ren & Stimpy Show) and the Looney Tunes characters, also he has theme music similar to SpongeBob's.
In the DVD version of the episode "Captain Girl," between Toot jumping through the water and Toot inside it, the narrator says "Three weeks later," then it shows the island of SpongeBob, with the Drawn Together house between the palm trees.
In "Unrestrainable Trainable," a newspaper describes Wooldoor as a "poorly conceived SpongeBob parody."
In "Finns of War," a sea sponge who looks like SpongeBob is seen.
SpongeBob SquarePants was mentioned multiple times in their sPOGIfy feat. Singing Baes segment.
In one episode, Alden Richards mentions "Mga baes, tandaan, 'wag kayong magkanta parang si SpongeBob." (Baes, remember, don't sing like SpongeBob.)
In another, it is mentioned "Huy! Ba't mukhang Squidward? Ngiti! Hahaha!" (Hey! Why do you look like Squidward? Smile! Hahaha!)
In their Juan For All, All For Juan: Bayanihan of da Pipol segment, in their October 16, 2014 episode, they visited a house with a SpongeBob backpack.
In "Wish Fixers," Timmy wishes to have running pants made of cheese, and then Cosmo calls Timmy "CheeseBoy SquarePants."
Another reference can be found in the episode, "Something's Fishy," where the king of Atlantis, Greg, states that the diets of the merpeople consist of "crabs, starfish, and the occasional underwater squirrel," as a joke to their fellow Nick animators.
Another reference can be found in the episode "App Trap" where the first kid with the smart phone has SpongeBob's pants, buck teeth, eyes, hair, and freckles.
Timmy sleeping near the mailbox in the episode "Take and Fake" is similar to the episode, "Chocolate with Nuts," where SpongeBob camps in the mailbox.
SpongeBob SquarePants has been referenced numerous times:
In "Prick Up Your Ears," Stewie is seen playing with a green SpongeBob toy.
In "Road to the North Pole," Stewie asks Brian if SpongeBob and Elmo are real and asks if SpongeBob really gives Squidward the business.
In "Turkey Guys," a balloon of a SpongeBob parody called "SpongeCow" is seen during a Thanksgiving parade.
In "Inside Family Guy," when Peter is doing a job as a Hollywood Boulevard mascot before deciding to return to the show, a person in a poorly made SpongeBob costume can be seen taking photos with tourists. In real life, there is a SpongeBob mascot on Hollywood Boulevard.
Fanboy and Chum Chum
In the episode "Cold War," Kyle gets chased by Fanboy and Chum Chum clones in a similar way to the robot chasing the man in the episode "Krab Borg." Yet, the episode has a similar plot to "Naughty Nautical Neighbors," and when Kyle enters the Fanlair, it's similar to how Squidward enters SpongeBob's house in "Pineapple Fever."
The episode "Excuse Me" has a somewhat similar plot to "Ditchin'."
In "I, Fanbot," after Fanboy as a robot causes everyone to fail the test, all the students come charging for him, and he flies out of the angry mob only to land back in it seconds later. The same exact thing happens to SpongeBob in "Bubble Buddy."
Chum Chum's pirate name in "Fanboy A'hoy!" is "Chumbucket," which shares the name of Plankton's restaurant.
In the episode "Caught in the Act," Martin refers to Nanny G as SpongeBob Hotpants.
In "It's All in the Executions," King Richard called Gareth, "Gare Bear," which is one of SpongeBob's nicknames for Gary.[debatable]
Genie in the House
In "World of Emma," Emma ended up wishing for Adil to make Sophie more like her. After he did, Sophie asked Emma if she had any pink nail varnish. Emma then replied with "Does SpongeBob have Squarepants?"
In "Asian F," when Kurt and Rachel are flipping through TV channels, SpongeBob appears briefly.
The Grim Adventures of Billy and Mandy
In "Be A-Fred, Be Very A-Fred," a creature resembling SpongeBob makes a couple of cameos.
The flower clouds have also been seen on The Grim Adventures of Billy and Mandy in the episode "Scythe for Sale," during the Sea Critters commercial.
In episode 13 of the anime Tengen Toppa Gurren Lagann, Squidward makes a brief appearance behind Viral, who is piloting an underwater mech in the scene.
In the episode "King of the Castle," Fee is shown holding a pizza box with the words "Pizza Castle" on it. Patrick mentions a restaurant of the same name in "The Bully," which was written by C.H. Greenblatt, creator of Harvey Beaks.
In the episode "Fee's Pyramid," when Fee is showing Foo the baby mobile she made for him, there is a snail on the mobile that slightly resembles Gary.
In the episode "Secret Gordon," if one looks closely in the garden right before it closes up, there is a hedge shaped like SpongeBob.
In the episode "On The Fence," Dade and Princess are arguing about what color to paint the fence. They're shouting "yellow" and "pink," in a similar way Patrick and SpongeBob are yelling at each other in "The Fry Cook Games."
The Frankini Bottoms from "Live and Dangerous" sounds similar to SpongeBob's home town Bikini Bottom.
In the episode "Caved In", Henry/Kid and Charlotte surprise Ray/Captain Man with a weekend of FUM which could be a reference to "Chum is Fum" from "Chum Bucket Supreme".
SpongeBob's name can be seen on a record in a comic store Sid and Stinky pass by.
The episode "The List" is similar to the episode "Best Day Ever."
House of Anubis
In the episode "House of Cameras/House of Numbers," Victor tried installing video cameras in order to try and keep a close eye on the students living in the Anubis house. While trying to get rid of the cameras, Nina mentioned that they needed help from their house's comedic duo. Although she meant Alfie and Jerome, Amber thought she was talking about "SpongeBob and Patrick."
In the episode "House of Crushes/House of Vertigo," Poppy asked Mara about what her dad's like. One of the things that Mara mentions is that he "dances like SpongeBob."
How To Be Indie
In the episode, "How To Fix A Friendship Fail," Marlon mentions a character named SnailBob StinkPants.
I Didn't Do It
In several episodes of this series, Delia calls Garret "Gare Bear" at one point. Gary is often called Gare Bear by SpongeBob.
In a commercial for Instant Mom, the lady plays a game where the viewer tells if it's real or fake and asks, "Is SpongeBob real?"
King of the Hill
In the episode "Tears of an Inflatable Clown," Kahn mentions SpongeBob when he wants to create a diversion. Hank and Peggy look at him oddly while Kahn replies "I don't know what kids like."
The Loud House
In the episode "Left in the Dark," SpongeBob and Patrick can be briefly seen on the television.
In the episode "Making the Grade," a poster in Lisa's kindergarten class shows characters from the show: a red crab (Mr. Krabs), a yellow sponge (SpongeBob), a pink starfish (Patrick), and a blue octopus (Squidward).
SpongeBob was parodied in some segments of this Cartoon Network series during its three year run:
Opening: A clay-animated character resembling SpongeBob is shown.
"Celebrity Birthdays" - Mort Jenkins, a jellyfish who landed the role of Jellyfish #56 on SpongeBob SquarePants, is one of the celebrities whom's birthday is being celebrated.
"WALL·E·NATOR" - The WALL·E·NATOR squeezes a round SpongeBob (who has eaten too many Krabby Patties) back into a square.
"Cliffordfield" - The Sesame Street character Big Bird gets squashed into SpongeBob by a rampaging Clifford the Big Red Dog, disproving his statement that he's "a one-of-a-kind children's character."
"Who Wore it Better?" - In this sketch, SpongeBob is one of the candidates among various others, who are being debated on who wore a white sundress best.
"MAD vs. Wild" - Bear Grylls, attempting to survive in the wild, plucks Gary from a tree stump and eats him, although regretting that he ate him while he still had his shell.
"Celebrities Without Their Makeup"- SpongeBob, dressed like an elf, is depicted as a fruitcake when seen without his makeup.
"¡AY Carly!" - A Mexican version of SpongeBob, named "Sponge-Roberto Squarepants," is shown at the end of the sketch.
"Law & Ogre" - A framed picture of SpongeBob is seen at the Big Bad Wolfgangbucks restaurant.
"Pirates of the Pair of Tweens" - Plankton goes "planking" with Captain Jack Sparrow on the roof of the "Crabby Crust."
"SpongeWOW" - SpongeBob is seen as SpongeWOW, a parody of the ShamWOW towel, in this infomercial spoof. He is used by a spoof of Vince Offer to wipe up various spills against his will, including twelve bottles of non-FDA-approved hot sauce, which leaves his face burning, and he even says, "Kill me now!"
"Abs-Duction" - Actor Taylor Lautner goes to Mr. Krabs' house, thinking he is his real father. Mr. Krabs responds by slamming the door at him, angrily.
"New Gill" - Ariel from The Little Mermaid tries to find a new boyfriend after being dumped by Prince Eric for Ursula, and ends up dating SpongeBob, who she finds to be too chipper for her.
"iChronicle" - SpongeBob and Patrick can be seen on a Nickelodeon blimp.
"Fart or Chair" - In this game show spoof, SpongeBob is seen sitting in a massage chair.
"The Blunder Games" - A SpongeBob balloon is seen at a parade (in a parody of the 2012 film The Hunger Games).
"Taking Nemo" - SpongeBob is interrogated by a furious Liam Neeson on the whereabouts of Nemo (from Disney/Pixar's film Finding Nemo).
"Dark Knight at the Museum" - SpongeBob is seen shouting "I'M READY!"
"SpongeBorg SquarePants" - In this sketch, SpongeBob is a cyborg that turns the inhabitants of Bikini Bottom into cyborgs.
Marvin's host father was bitten by an alien, and started hallucinating, he then held up an umbrella and said "Here's your clarinet Squidward."
The episode "TD Makes the Band" is similar to "Band Geeks".
In the episode "Martha: Secret Agent Dog", the boss of the agency was trying to take the Granny Flo's secret alphabet soup formula similar to how Plankton tries to steal the Krabby Patty Secret formula.
SpongeBob is mentioned two times in Millie Inbetween, once mentioned and SpongeBob, Patrick and Mr. Krabs are shown on different pictures in a scene.
Milo Murphy's Law
The episode "Battle of the Bands" has a similar plot to "Band Geeks".
In the episode "Fungus Among Us," a title card similar to the one in SpongeBob is shown and a narrator similar to Frenchy
Mickey Mouse (2013)
In the episode "Road Hogs," Mickey's scooter topple over a row of motorcycles from a gang of pig bikers similar to how SpongeBob knocks over a row of fish bikers' motorcycle from "A Life in a Day." Ironically, all of the pig bikers are voiced by Clancy Brown, Mr. Krabs' voice actor.
My Life as A Teenage Robot
The "I love you" pun from the episode "Party Down" might be a reused joke from "Chocolate with Nuts".
The episode "Crash, Pad, Crash!" is similar "New Digs".
My Little Pony: Friendship is Magic
In the episode "Party of One," when Pinkie Pie gets in the hay, she is similar to SpongeBob when he and Sandy enter the needlestack in Prehibernation Week.
Ned's Declassified School Survival Guide
In the episode "Photo Day," one of the kids wears a SpongeBob costume for their school photo.
Not Going Out
In an episode of Not Going Out, Tim mentions SpongeBob SquarePants.
In "Casino," Oggy is seen hiding in the mailbox and pops out to receive his mail (Jack does the same thing later), which is similar to how SpongeBob scares the mailman in the episode "Chocolate with Nuts."
In the pilot episode there is a cameo of an identical character to SpongeBob appearing at a nightclub between the characters. The character even makes it clear that is not SpongeBob, but a cheese while chatting with a female bread.
In a season 2 episode, "No More Bunny Business," Phineas scares a mailwoman similarly to how SpongeBob scares a mailfish in the episode "Chocolate with Nuts."
During the song in the episode "Atlantis," Ferb is drinking tea the same way SpongeBob and Patrick did in "Tea at the Treedome."
In "Phineas and Ferb-Busters," Doofenshmirtz runs away from a robot similary to the guy in the scary robot movie from "Krab Borg." Also, Doofenshmirtz and the guy being chased by the robot are both portrayed by Dan Povenmire, who was also a writer, storyboard artist, and storyboard director on SpongeBob, meaning this reference pretty much comes full circle.
In "Summer Belongs to You," Phineas finds a sponge and a starfish while digging a hole on a deserted island, a reference to SpongeBob and Patrick.
The episode "Oh, There You Are Perry," is similar in many ways to "Have You Seen This Snail?" For example both owners put fliers up all over town after they realize their pet ran away. The boys also sing a song similar to Gary Come Home.
Pig Goat Banana Cricket
In the episode "Pig Goat Banana Cricket High Five!," The Shragger takes his sunglasses off, only to reveal he has another pair of sunglasses on. Dennis does the same exact thing in The SpongeBob SquarePants Movie.
In the episode "Cow Duck Avocado Mantis," Avocado is seen being hit with many trophies as they slid down from a shelf. This could've been a reference to a very similar scene from the episode "Squid's Day Off."
The Powerpuff Girls
The original series episode "Curses" has a similar plot to "Sailor Mouth."
The song "K.E.A.N.E." from the original series episode "Substitute Creature" is a parody of the song "Fun" from "F.U.N.".
There is an episode in with similar plot to "My Pretty Seahorse" named: "Helter Shelter" where Bubbles refuses to give up a baby whale despite the Professor ordering her to get rid of him, but eventually agrees near the end of the episode.
In the episode "Imagine That", the way Bubbles waves her hand and forms the word "IMAJINASHULN" which mispelled "imagination" was a well-known phrase from the episode "Idiot Box".
In one episode, when Hanna is talking to Mona, she mentions SpongeBob and Patrick.
Puppy Dog Pals
In the episode "Hawaii Pug-Oh", there's music similar to music played in SpongeBob.
The episode "This Is My Jam" is similar to "Earworm."
In That Hurts Me, a sponge and a starfish dance with each other, then run out of energy. They crawl offscreen, exhausted, and then they can be heard snorting cocaine, and then the two run back on screen with high energy and dance with each other again. The characters in this sketch resemble SpongeBob and Patrick.
In Tell My Mom, Sandy gets pregnant and SpongeBob realizes she used himself (a sponge) to protect her.
In Major League of Extraordinary Gentlemen, SpongeBob discovers Mr. Krabs' secret formula for Krabby Patties and reveals it to the patrons of the Krusty Krab: they are made from crab meat. He he also points out to Squidward that the calamari rings he is eating are actually made from squid (while oddly, Squidward is an octopus), and informs a customer that her "Chicken of the Sea" salad is made with tuna. An angry mob of customers approach Mr. Krabs and attack him. SpongeBob then says that he's glad nothing disgusting ever happens to a sponge, and the scene cuts to a nurse informing a morbidly obese patient that she will be scrubbing deep within his rolls of fat with a sponge, and his examination will then be over. SpongeBob then pushes the scene aside, reiterating, "Nothing disgusting ever happens to a sponge!" A squish is then heard from the other scene, and the nurse says, "I hope that's pudding in there."
Sam and Cat
In the episode #TextingCompetition, when Cat was mentioning what she could do with the speed boat, she said "Number 3, look for SpongeBob's pineapple!"
See Dad Run
Janie mentions being famous like SpongeBob SquarePants and David says you can't be famous just by popping out of a pineapple.
David enters a shop, mentioning about something SpongeBob-related he found.
An episode spoofed SpongeBob as "TriangleBob TrianglePants" which was Telly Monster's favorite show. The show starred human cast member Bob, as a triangle man version of SpongeBob.
As an effort to help spread diversity in society amongst elementary school age children, the "We are Family Foundation" made a music video of the popular disco song of the same name, with multiple characters from shows on Nickelodeon? Disney Channel, and PBS Kids. The Sesame Street muppets were used heavily in the video, while clips from "Bubblestand" and "Jellyfish Jam" were shown throughout. However, since the company sponsoring the video got confused for a similarly named company that promoted same sex marriage, the media interpreted a rumor that Spongebob and Patrick are a gay couple.
In "She Used to Be My Girl," Lisa, needing a god to pray to, tells a newscaster she is praying to Jesus, Buddha, and SpongeBob. Then the camera shows heaven, where Jesus, Buddha, and crudely drawn SpongeBob are. Buddha asks Jesus, "Perhaps we should help?" and SpongeBob interrupts, saying "Screw her!," then laughs insanely, while Jesus shakes his head.
In "The Wife Aquatic," Marge and Lisa go to an aquatic museum where there is an exhibit that reads "The Science of SpongeBob" and it shows a SpongeBob statue next to it. Patrick Star also appears as one of the mollusk photos.
In The Simpsons Movie, SpongeBob can be spotted in the angry mob that wanted to kill Homer for trapping them in the dome.
In "Treehouse of Horror XX," a Frankenstein's monster was dressed in a SpongeBob costume. Later, SpongeBob told the Simpsons he was secretly very evil.
In "Angry Dad: The Movie," Bart mentions SpongeBob when he claims he likes cartoons. He says: "I've always loved cartoons, going way back to the real early SpongeBobs."
In "Yellow Subterfuge," When Krusty asks to Lisa if could sell foreign rights to your show, Lisa says that even SpongeBob did it. She shows him an Italian parodied version of SpongeBob SquarePants on her tablet called Spugna Roberto Quadrati Pantaloni ("Sponge Roberto Square Pants"). In the show, Spugna Roberto (a parody of SpongeBob SquarePants) gives a gift to Squiduardo Calamari (a parody of Squidward Tentacles) for his birthday; the gift is a landmine from World War II. Squiduardo declines the gift, and while he is talking, a non-anthropomorphic seahorse lands on the landmine's button, detonating it and blowing Spugna Roberto & Squiduardo to pieces. A fish arrives at the scene and exclaims "Calamari?, Noooo...!!!" and starts crying. In the parody, Roberto lived in a watermelon under the sea, spoofing SpongeBob's pineapple house.
There is an episode similar to "My Pretty Seahorse" called "Buster" where Sticks the Badger doesn't want to give up her pet which turned out to be one of Dr. Eggman's inventions.
In one episode, SpongeBob appears only he was green instead of yellow.
In another episode, SpongeBob was seen in the background several times.
So Little Time
In, "Manuelo in the Middle", Larry the Lobster has been mentioned in one scene.
The running gag of Dylan saying swears in the episode "R-u-n-Runaway" is similar to "Sailor Mouth".
In the second season episodes ""B-i-Bikini U-n-University" and "S-i-Silent Night", Dylan secretly keeps a pet snake after she was told not to from Maya similar to how SpongeBob kept Mystery the Seahorse when Mr. Krabs told him not to in "My Pretty Seahorse" and Maya finds out.
In the episode "House of The Holy," Sam uses a SpongeBob Placemat in place of an altar cloth for the séance of a "angel."
In the episode "Driving New Business," Brett and Wayde went to a aquarium featuring Bikini Bottom.
Teen Titans Go!
In the episode "La Larva de Amor," when Silkie meets Sonia, the Teen Titans cannot find Silkie. It is similar to "Have You Seen This Snail?"
In the episode "Staring at the Future," the Teen Titans saying responsibility is similar to SpongeBob saying the word "imagination" the way he did in "Idiot Box." Later in the episode when Beast Boy and Cyborg become traumatized at the thought of having to become responsible for their actions, the word "responsiblity" echoes similarly to the echo of the word "alone" from "SB-129."
In the episode, The Beast of Sodor, every time an engine or other character mentions "the abominable snowman," Dramatic Impact 2 plays, except in the beginning of the episode. But it was heard one more time when Sir Topham Hatt hears that Dowager Hatt called him the abominable controller when she was on Thomas.
There is a SpongeBob theme in the Mini collection.
In the episode "Evil Never Sleeps" a reference to SpongeBob SquarePants is made when Nora had said, "What in Bikini Bottom is happening right now?" to Billy and Chloe.
SpongeBob has been shown and mentioned several times:
In the episode "Tentacle Face," when Mr. Stockley is leaving Troop HQ, he's wearing a SpongeBob backpack.
In the episode "The Substitute," the SpongeBob theme song can be heard on Mr. Stockley's TV when he's talking to Jake on the phone, and Mr. Stockley mentions SpongeBob & Patrick to his dentist.
Two and a Half Men
In the episode "Alan Harper, Frontier Chiropractor," Jake explains the series to Evelyn, to which she replies "So bottom line...he's a sponge?" This clip was shown in Square Roots: the Story of SpongeBob SquarePants.
In the episode "New Kid," Tommy imagines himself working at the Krusty Krab, also Squidward appeared green with one eye.
Uncle Grandpa uses a hammer that shoots out lazers several times. Like SpongeTron, who uses a lazer hammer in SB-129 to thaw out Squidward.
In the episode "The Song," Zack voted for SpongeBob SquarePants in the "Your The Best Friend Ever" contest.
In "Tori Gets Stuck," Tori asks Robbie why he was wearing SpongeBob underwear, which he covers with his pillow.
In "Tori Goes Platinum," the paparazzi think Sikowitz is the voice of Plankton.
In the ABC cartoon The Weekenders, there was a rock band called the "Chum Bukkit," which is probably a reference to the Chum Bucket.
Welcome to the Wayne
In "Like No Other Market on Earth" Equimorph morphs into a copyright friendly version of SpongeBob SquarePants known as "SpongeRobert RectangleShorts" who was voiced by Tom Kenny, SpongeBob's voice actor.
What's in the Bible
In the 4th JellyTelly DVD, Michael mentions his brother was wearing some SpongeBob underpants & later calls him "Mr. SpongeBob UnderPants."
An episode of The X Presidents (from "TV Funhouse" on Saturday Night Live) depicts SpongeBob refusing to star in a pro-Gulf War II propaganda commercial, and getting held prisoner for it. Tom Kenny provides SpongeBob's voice, which is surprising as this clip has relatively adult content.