"[4] In a Pearls Before Swine comic strip, Pig declares it to be Opposite Day.
The (normally good-natured) character Pig then violently punches Rat out of the strip and says "things are different on 'Opposite Day'.
"[5] A season 1 episode of SpongeBob SquarePants centers around the titular character's celebration of the holiday by dressing as and acting like his neighbor Squidward Tentacles.
An episode of the YouTube web series asdfmovie jokes about it being Opposite Day and abruptly ends the segment with a self punch in the face.
In The Whitest Kids U' Know sketch "Opposite Day Lawyer", a defense lawyer with a guilty client tells the jury "in five seconds, it will officially be Opposite Day" so they will vote "not guilty".