Episode 21 of "Sabrina, the teenage witch"
s01e21 As Westbridge Turns

A bored Sabrina gets more than she bargained for when Hilda offers her a "can of worms" spell to spice up her daily grind, which is transformed into a melodramatic soap opera. When a mysterious one-eyed janitor accidentally beans Harvey with a ladder, Sabrina's sweetheart wakes up with amnesia, and a dastardly Libby seizes the chance to steal him, convincing him that he has agreed to kiss her publicly at the climax of the school fashion show... Libby also steals the diamond ring Mr. Poole is about to offer the buxom school nurse and plants it on Sabrina, who must enlist her aunt's help to demonstrate her innocence before the spells runs its narrative course. A chastened Sabrina joins Salem in the less hazardous hobby of watching floating lint.