S5·E8 Is it Magic or Imagination?

Mrs. Stephens drops in unexpectantly, and insists Samantha enter a slogan contest to win a trip to Tahiti. And she wins! Of course, Larry Tate's none to happy as it turns out to be one of their biggest clients. The typical Stephen's fight occurs. Darrin's furious! He thinks Samantha used witchcraft. Darrin heads to the neighborhood bar, gets drunk, and tells the he's married to a witch. Darrin comes around when Samantha's slogan is rejected after all.