Annoy Squidward Day grew out of a gag in the SpongeBob SquarePants episode "Employee of the Month," which aired March 8, 2000, where SpongeBob points to a calendar marking "the 15th" as the day to annoy Squidward. The episode never names a month, and no person or organization founded the observance; fans later fixed it on February 15 and spread it online, after which official SpongeBob accounts began marking it.
The gag that escaped the screen
The seed was planted in "Employee of the Month," a first-season episode that aired in March 2000. In it, SpongeBob references a calendar where one date is set aside for annoying Squidward. The joke lasts seconds.
It was never meant to be looked up, debated, or turned into an annual event. But cartoons leak into the real world, and this one leaked through a calendar square.


