Do Not Watch If You Are Due To Go Skydiving Anytime Soon

Jumping out of a plane with just a parachute is hardcore enough, without having to deal with one of your buddies hurtling into your back and knocking you unconscious. This dramatic footage from skydiver James Lee who was 12,000 feet above when he became completely unresponsive.

http://www.youtube.com/watch?feature=player_embedded&v=tZHag3DBTaA