Warning, some of this stuff is really brutal and hard on the eyes. But there's some funny vids too.
MMA, the combatants are women and the injury happens near the end. It is typical of what happens when a commitment to a movement is made and the whole momentum of the body becomes the driving force. It's amazing this sort of thing doesn't happen more often. http://www.youtube.com/watch?v=MQJ8fKTmw8E&feature=related
MMA, not a very high caliber fighter goes against a wrestler and gets brutally slammed. The body's reaction to the slam is interesting. http://www.youtube.com/watch?v=nx2BRJLkjCg&feature=related
BJJ, this is a very serious move by JJ player. I know the position well and have always felt that the bottom person can be taken advantage off just never knew how. Maybe because in BJJ we always calculate moves to be applied in a controlled way so as not to injure our training partner. There is not way IMO to apply this move in a controlled way. I suspect the guy who did it knew that and still chose to do it. This is exactly why I'm weary of competitions. http://www.youtube.com/watch?v=WO_qFMo6hRo&feature=related