S5, E30: Samantha and Darrin are in Mexico City where Darrin is working on a new account for McMann and Tate. Endora puts a spell on him that makes him disappear when he speaks Spanish. Samantha gets her mother back who has the nerve to reverse the spell, this time, making Darrin disappear when he speaks English! Samantha helps him out when he delivers an excellent speech to Spanish and American patrons.