There are a few Urban Legends that I know about, though some of them have not been proven.
There's the one about the couple sitting in the car making out in the woods, and the Boyfriend leaves to take a piss, or something like that, and a
few minutes later the girlfriend hears a scraping on the top of the car. She gets out and her BF is hanging from the tree dead.
There's the one where the college students are playing a prank on a classmate, and they tie a cadaver hand to a light string in the closet, to scare
the classmate, and they end up scaring her/him to death.
There's a thread already on here on the "aren't you glad you didn't turn on the lights" one.
www.snopes.com...