In this comedy classic, Jerry Lewis plays Jerome Littlefield, an orderly in a mental hospital in this slapstick situation comedy that makes full use of Lewis's patented brand of screwball comedy. Dr. Jean Howard (Glenda Farrell) is the exasperated head of the sanitarium who almost becomes a patient after the antics of the frantic employee. Jerome takes on the symptoms of most of his patients and helps Susan Andrews (Susan Oliver) go from a woman considering suicide to an alluring woman of sensual confidence. When talkative patient Alice Pearce relates her maladies to Jerry, he hilariously has psychosomatic symptoms that mirror those of the woman.