A whoopie cushion is a practical joke device involving flatulence humor, which produces a noise resembling a "raspberry" or flatulence. It first appears in the episode "Fools in April."
Whoopie cushions are made from two sheets of rubber that are glued together at the edges. There is a small opening with a flap at one end for air to enter and leave the cushion. In most episodes, they are red or pink, although the one shown in "Fools in April" is green.
Role in series
"Fools in April"
Mr. Krabs takes a seat on his office chair and hears a flatulence noise when he sits down. SpongeBob had put the whoopie cushion there as an April Fool's prank.
This is one of the novelty items offered by Frank when SpongeBob and Patrick are looking for the best gag in stock to prank all of Bikini Bottom with.
At the end of the episode, when Mr. Krabs shines spotlight on the pair to showcase the "live nude pranksters" at the Krusty Krab as a comeuppance, an embarrassed SpongeBob tells Patrick in regret that they should have bought the whoopie cushion instead of the Invisible Spray.
After Squidward tells SpongeBob that excessive laughter will result in permanent loss of his laugh box, SpongeBob tries his best to control his laughter. After getting off work, he encounters a whole street of whoopie cushions from a whoopie cushion truck and ultimately tries to avoid stepping on any of them, to no avail, so he runs away to hide himself from the humorous nature of the object.