A fisherman crosses paths with a diamond-smuggling gangster–who is his doppelgänger—and inadvertently takes his place at a resort hotel where he meets a special girl.

Poor Jerome Littlefield. He wants to be a doctor – but that's not exactly the perfect career choice when you're hopelessly squeamish. So he settles for the job of orderly at the Whitestone Sanitarium, a career move that's guaranteed to keep the patients – and viewers – in stitches!

Stanley is a bellboy at the Fountainbleau Hotel in Miami Beach, where he performs his duties quietly and without a word to anyone. All he displays are facial expressions and a comedic slapstick style. And anything that can go wrong, does go wrong when Stanley is involved. One day, Jerry Lewis arrives at the hotel and some of the staff notice the striking resemblance.