OPPOSITE DAY. I love this episode a lot. Although It has some Squidward abuse and I felt bad for him too but I didn't mind Squid abuse much because It's all Squidward's fault. If he didn't tell SpongeBob the day is Opposite Day, he would sell his house and leave Bikini Bottom forever. This episode cracked me up. There are many funny parts like the begining, Patrick holding his breath, SpongeBob destorying his house, SpongeBob and Patrick pretending to be Squidward, Gary as Squidward and the ending. Overall, this is one of the best season 1 episodes. 10/10