The Jerk (1979)

A simpleminded, sheltered country boy suddenly decides to leave his family home to experience life in the big city, where his naivete is both his best friend and his worst enemy. That wild and crazy guy, Steve Martin, makes his film-starring debut in the wacky comedy hit The Jerk. Steve plays Navin Johnson, the adopted son of a poor black sharecropper family, whose crazy inventions lead him from rags to riches...right back to rags. Steve propels Navin through a string of misadventures-becoming smitten with a lady motorcycle racer, surviving a series of screwball attacks by a deranged killer, and becoming a millionaire by inventing the "Opti-grab" handle for eyeglasses-and shows why he's one of the hottest comic performers in the world. After discovering he's not black like the rest of his family, likable dimwit Navin runs off on a hilarious misadventure in this comedy classic.