I Had an Accident SpongeBob SquarePants : Season 3 Episode 33

SpongeBob shatters his buttocks in a sandboarding injury. He soon becomes paranoid of everything and confines himself to his own home with inanimate objects for friends. Sandy and Patrick try everything to come him out, but find they must resort to trickery to succeed. Patrick dresses as a gorilla and someone who looks like him comes up, it turns out to be a real gorilla and puts Patrick and Sandy in a bag forcing SpongeBob to help them.