Episode 14 of "Sabrina, the teenage witch"
s01e14 Sabrina Through The Looking Glass

A stressed-out Sabrina gets a monstrous wart, which only worsens her foul mood. And despite everyone's efforts to cheer her, she seeks solace and solitude in an alternate world inside her mirror, where she becomes trapped in her own bad mood. Baltimore Oriole Brady Anderson appears as himself to guide her through the realm of making amends -- to Jenny for ignoring her, to Harvey for ridiculing his use of a puppet spider monkey to get them through a school assignment she flubbed, and to Libby for turning her into a goat. In the end, she endorses Aunt Hilda's recipe for a good time - a gigantic flan.