迈克·墨菲(杰克·尼科尔森杰克·尼科尔森饰)为了逃避监狱里的强制劳动，假装精神异常，被送进了精神病院。他的到来给毫无生气的精神病院带来了严重的冲击。迈克要求在电视上观看棒球比赛，这挑战了医院的严格管理制度，并受到护士长雷切尔(路易丝·弗莱彻·路易丝·弗莱彻饰)的阻挠。迈克带领病人出海打鱼，鼓舞了他们

　　A homicidal maniac is accidentally released from a hospital because of a computer error and heads to the site of his past murders to continue his pe