SpongeBob SquarePants S01 E38 Fools in April

"Be there and be square!"

Squidward wakes up and finds out it is April Fools Day. April Fools Day is SpongeBob's favorite holiday so Squidward becomes paranoid, thinking SpongeBob will play a joke on him. Squidward plays a mean trick on SpongeBob, but after SpongeBob runs home crying, Squidward must apologize.