Bewitched (1964)

Season 3: Episode 8

A mysterious man named Diaper Dan has bugged the Stephens' household to steal advertising ideas from Darrin for a rival advertising company. No one finds this out until Samantha and Darrin gets into an argument. Dan hears all this and has flowers delivered to the house. After Samantha finds out that the flowers were delivered by Dan, she discovers the leak and the bug! Sam and Endora both give Dan a hard time.