The Hook is a classic example of an urban legend. The basic premise involves a young couple parked at a dark lovers' lane. The radio plays music as the couple make out. The music is interrupted by an announcer who reports that a serial killer has just escaped an institution which is nearby. The killer has a hook in place of one of his hands. For varying reasons they decide to leave quickly. The legend ends with the discovery of the killers hook attached to the outside handle of one of the doors. Many variations include the sound of scraping on the car door. Some legends have the same beginning, but end up with them seeing him first, warning some others, then having him come to their car. They try to escape, but end up with him holding on to the top of the car. It ends with both dying.
In an alternative version of the story, the couple while driving through an unknown part of the country decide to stop the car in the middle of the woods at night because the man has to relieve himself. While waiting for him to return, the wife/girlfriend turns on the radio and hears about the escaped mental patient. She notices that her husband/boyfriend has not returned yet and is disturbed many times by a loud thumping on the roof of the car. She eventually exits her car and sees the crazy man on the roof of the car holding her husband's decapitated head in his hand and hitting the roof with it. Other variations tell of her seeing her husband/boyfriend's butchered body suspended upside down from a tree above the car with his fingers dangling just above the roof.
References to this legend have been found from at least the 1960s.