To Tell the Truth - S1.E8

When Mork tricks Mindy into believing that he can predict the weather, Mindy tells him that he should never lie. The music store's despicable landlord, Arnold Wanker, dies while trying to evict Fred from the music store. Mork, hearing the family try to comfort his widow, assumes that that Wanker is their friend, and brings him back from the dead.