On "Best Friend's Day", Patrick gives SpongeBob an enourmous wad of used gum he has amassed over his entire lifetime (fondly referred to as "Gummy"), and SpongeBob finds it a better gift than his own (a robotic butler). However, when he takes it inside, he realizes how disgusting it is, and it even starts to scare him, with a pair of underpants crawling out of the gum and saying in a demonic voice, "You're not Patrick!" First, SpongeBob tries to throw it away, but Patrick catches him in doing so, and he says that he was dressing it up with the garbage can. Later, SpongeBob tries to bury Gummy, but Patrick catches him again, and he says that he dug the hole to be able to look at Gummy from below. Patrick insists that it must be displayed properly, and places it above SpongeBob's doorway. SpongeBob next tries to dispose of it in the night, and in the process frees several people who were literally trapped inside it. He tries to pull Gummy off of his house, and fails, destroying the ball and getting stuck to it in the process.
The next day, Sandy visits SpongeBob's house to see it covered in the sticky remains of Gummy, with SpongeBob hanging above his doorway. She tries to free him by lassoing a piece of Gummy onto a passing truck, which is almost able to pull it away, but is ultimately pulled in by it, hitting SpongeBob's house and causing the gum to explode, completely covering the houses of SpongeBob, Squidward and Patrick, and trapping Squidward and Sandy as well. Patrick then appears, and SpongeBob tells him he can have Gummy back. Patrick then wolfs down all of the gum making Patrick obese, freeing SpongeBob, his friends and their houses. However, he then hiccups a massive bubble, which explodes and covers the whole town in gum.
( ‣ ) Associated production music
( • ) Original music
( ◦ ) SpongeBob music
‣Hawaiian Sting 3 - Sage Guyton, Jeremy Wakefield [title card] ‣Olympus (a) - Richard A. Harvey [opening] ‣Gator - Steve Belfer [Patrick rolling a giant ball of gum to SpongeBob's house] ‣Brass Flourish (k) - Barrie Hingley ["This chewing gum is my most beloved possession."] ‣Whisper from the Past - Gregor F. Narholz [SpongeBob cries] •Goofy Conversation - Nicolas Carr, Barry Anthony [robot servant] ‣The Promised Land - David Farnon [SpongeBob welcomes Gummy into his home] •Steel Sting - Jeremy Wakefield ["You sure are a big boy, aren't you?"] ‣Harp Ding - Nicolas Carr [Spongebob gets an idea] ‣Crime Squad - John Cameron [karate] •Steel Licks - Jeremy Wakefield [SpongeBob crawls out] •Drama Sting - Sage Guyton, Jeremy Wakefield ["With your dirty sock, used toothbrush..."] ‣Dramatic Cue (h) - Ronald Hanmer ["Get a hold of yourself, SpongeBob."] ‣Tomfoolery - David Snell [SpongeBob throwing Gummy away] ‣Zelle 504 - Gerhard Trede [SpongeBob digging a hole] ‣Steel Link (a) - Jeremy Wakefield [SpongeBob deflates] ‣Seaweed - Steve Belfer [Patrick puts Gummy above SpongeBob's front door] ‣Hawaiian Cocktail - Richard Myhill ["Oh, what am I gonna do, Gary?"] •Vibe Sting - Nicolas Carr [SpongeBob gets an idea] ‣ ? [SpongeBob dressed as a burglar] ‣Hercule Poirot - Gerhard Trede [that night] •Vibe Sting - Nicolas Carr ["Who are you?"] ‣Holy Grail - Larry Hochman ["Oh, thank Neptune!"] ‣City Heat - Gerhard Trede [SpongeBob tries to pull Gummy off his house] • ? - Nicolas Carr [Sandy steps in gum] ‣Towerstreet 17 [#41] - Gerhard Narholz [SpongeBob's house covered in gum] ‣Dramatic Cue (h) - Ronald Hanmer [Sandy gasps] ‣Stepping into Danger - Mike Sunderland [Sandy tries to free SpongeBob] ‣Chase Cue 1 - Sage Guyton, Jeremy Wakefield [truck drives by] ‣Runaway Train - Harry Bluestone, Emil Cadkin ["Hang on tight, SpongeBob!"] ‣Comic Walk - Sidney Torch [Squidward and Sandy get stuck] ‣Caliope Carousel - Roger Roger ["It's like a gummy wonderland!"] •Goofy Conversation - Nicolas Carr, Barry Anthony [robot gives Patrick a massage] ‣Pua Paoakalani B - Kapono Beamer, Queen Lili'uokalani ["Patrick, do you miss your Gummy?"] ‣SpongeBob Theme - Jeremy Wakefield, Sage Guyton [Patrick eating the gum] ‣Harp Gliss 1 - Otto Sieben [harp music] ‣ ? [Patrick hiccupping] ‣Hawaiian Sting 6 - Sage Guyton, Jeremy Wakefield [ending]
The German title, "Gummilein", is also to the German name of Gummy.
When SpongeBob is giving Gummy back to Patrick, he tells him that it is still Best Friends Day. However, the episode took place over two days. This error is further reinforced by SpongeBob saying "Well, it's still Best Friend's Day..." close to the end of the episode. However SpongeBob could have been trying to trick Patrick into taking Gummy back, or Best Friends Day is a multi-day holiday.
Originally, the writers planned to color the gum blue instead of pink.