Samantha gives a dinner party to impress Rex Barker, one of Darrin's clients. Rex brings along his date, Babs Livingston, but advances on Samantha in the garden when he gets drunk. To teach him a lesson in treating people with respect, Samantha changes him into a dog. Darrin, thinking only of the possible loss of the account, is furious and Samantha locks him and the dog out. Endora sets a cat on the dog (Big mistake!). Samantha takes Barker to a vet and then changes him back to a man. The next morning, Barker, not having learned a thing from the night before, again makes a pass at Samantha (Very BIG mistake!). Darrin punches him and quits on the spot. Later, Barker apologizes and signs the contract on condition that Darrin return to the agency.