One Flew Over the Cuckoo's Nest

While serving time for insanity at a state mental hospital, implacable rabble-rouser Randle Patrick McMurphy (Jack Nicholson) inspires his fellow patients to rebel against the authoritarian rule of head nurse Mildred Ratched (Louise Fletcher). This Milos Forman masterpiece was the first film since It Happened One Night (1934) to take all five major Oscar prizes for picture, director, screenplay, actor (Nicholson) and actress (Fletcher).