Squidward's Suicide
The most popular image of a supposed screen cap of "Squidward's Suicide"
Squidward's Suicide (also known as "Red Mist") is an urban legend from the horror website, Creepypasta. The story is narrated in a first person perspective by a supposed intern who used to work at Viacom (the company that owns Nickelodeon and its shows) who had early access to future SpongeBob episodes as he recounts his experience watching the episode with other interns. The story was supposed to be for "Fear of a Krabby Patty," though the early details explain a very disturbing and morbid episode about Squidward doing a poor performance at a clarinet recital, accompanied by footage of Squidward mourning at his failure, as well as illegal photos of dead children massacred by a shadowy photographer being put in as subliminal messages until ultimate the story culminates to a voice saying "Do it" and Squidward shooting himself in the head. An image associated with it is of Squidward with "hyper-realistic" bloodshot eyes. The "lost" episode was adapted several times and in different formats on YouTube. The identity of the person who made the pasta is unknown, although certain people suspect a disgruntled animator called Andrew Skinner. It is not proven though that it is him.
However, SpongeBob fans think that the episode "Are You Happy Now?" was inspired by this urban legend due to the episode being depressing and Squidward's attempts for suicide.
SpongeBob (Speedy)
Many SpongeBob episodes posted on YouTube are often sped up, because of copyright from Viacom (who own Nickelodeon, which airs and produces SpongeBob). It is one of the oldest SpongeBob-related phenomena on YouTube dating back to pre-copyright removal status which has been around since 2007. They can be specified as two types: Chipmunk and non-Chipmunk. Chipmunk is based from Alvin and the Chipmunks, as the characters' voices have been made higher-pitched. Non-Chipmunk involves the characters speaking with their regular voices (making them easier to understand), but the rest of the episode is sped up.
SpongeBob Backwards
Spongebob Theme reversed (no lyrics)
This features episodes of SpongeBob played in reverse to express humor and at times, people notice hidden sentences in it. A similar phenomenon called "SpongeBob Theme Song in Reverse" plays the song backwards often with lyrics showing it has inappropriate lyrics in reverse (especially on the "Drop on the deck and flop like a fish" line reversed). There is also a phenomenon in which SpongeBob and Patrick speak backwards from Opposite Day played in reverse to show what they are really saying.
SpongeBob Acts of Violence
These videos depict SpongeBob committing various acts of violence such as SpongeBob Kills Patrick and SpongeBob Goes Crazy With An AK-47. These videos are very bloody and graphic. The purpose of these videos is entertainment but they sometimes offend some viewers. Other videos other than these show SpongeBob killing characters from other children's cartoons,video games, movies, etc.
You Have Met Spongebob on Club Penguin
This meme includes a Club Penguin character waving to SpongeBob while the notification box says, "You have met SpongeBob! Would you like to give him a high-five and rob him afterwards?
SpongeBob Bootleg Episode
SpongeBob Bootleg Episode is a Creepypasta. It contains an edited version of Dumped. The only image in it was a picture of SpongeBob with big, bloodshot eyes and no mouth. The rest was either color images or black screens. Most people who have stared at the image believe SpongeBob will blink.
Surprised Patrick
In The SpongeBob SquarePants Movie SpongeBob and Patrick are being chased by a monster with a tongue shaped like an old woman. The monster then falls into a ditch and is eaten by another monster which is eaten by another monster, and this cycle continues for quite some time. When it is over, the camera zooms in to Patrick and SpongeBob sitting there with surprised faces on. People will take Patrick and put him in some other picture or gif with a surprising event going on. This meme has become extremely popular, and has even been used by Nickelodeon, as in KCA's Starstruck Patrick for 2015 and 2016.
Kids' Choice Awards - StarStruck Patrick - Nick
2015 Kids' Choice Awards
SpongeBob SquarePants Star-Struck Patrick Is Ready For KCA
2016 Kids' Choice Awards
Gentle Breeze fad
The original video.
Since then, many users have made fads like that one, with images of Moar Krabs, Squishward and from other memes/episodes.
In other videos related to this, that background music is often edited and there's a picture of someone at the end saying "Yes!".