Phantom Hitchhikers
You know the story. A hitchhiker (usually a woman but not always) asks for a ride and the driver picks him or her up. Once they reach their destination, they disappear, only to leave the driver to discover that he or she had been dead for many years. He or she often tells the story in a tavern or bar to a group of grim locals who inform the driver that the hitchhiker was a girl who died in a car crash on prom night or something like that. The urban legend is so popular that it was the subject of the pilot episode of the hit CW series Supernatural.