S5·E27 Daddy Does His Thing

Maurice gives Darrin a magic lighter, which Darrin doesn't accept. Maurice turns Darrin into a donkey because of his ingratitude. Samantha tries to find her father and finds him in Paris. She returns to see that Darrin the donkey has been taken to an animal shelter. Darrin is released and Maurice back tracks everything that he did to turn Darrin back to a human.