“McMurphy” (Jack Nicholson) is a veteran with an attitude who has pled insanity to escape his latest court appearance on a charge of statutory rape. He is sent to an evaluation hospital where they are to decide just what, if anything, is wrong with him. His smart-assed confidence endears him to some of his fellow inmates, especially the impressionable “Billy” (Brad Dourif) but also earns him the instant enmity of the chief nurse “Ratched” (Louise Fletcher) who is used to ruling with a psychological rod of iron augmented by pils, pills and more pills. Initially, “Mac” is simply concerned with h...