The Ghostly Hitchhiker and the Weeping Woman

The ghostly hitchhiker idea, a stranger ill-met on the road, is a very ancient story. It has become one of the most popular American ghost stories because it keeps showing up in oral tradition and popular media. There are even police reports that appear to be at a loss to explain how a hitchhiker was there one moment gone the next. We'd love to hear all of your favorite urban legends.