"S1 E2a - Opposite Day.mp4" is a video file for the SpongeBob SquarePants Season 1, Episode 9b, which originally aired on September 11, 1999. The plot follows Squidward’s failed attempt to sell his house by tricking SpongeBob and Patrick into observing "Opposite Day," leading to chaotic impersonations of Squidward that drive away potential buyer Patty Rechid. Detailed episode information is available at Encyclopedia SpongeBobia . 09b. Opposite Day - Forums - SpongeBuddy Mania