RATED PG-13/R
A few years ago there was a snowmobiling accident involving two drunk buddies on a local lake. One guy fell through and the other went looking for him. As the one guy stuck his head through the hole in the ice, his buddy hit him at about 90 mph decapitating him. When the fire department arrived, they found his head still in the helmet. That was the worst I've seen. They were charging his buddy with involuntary manslaughter I think last I heard but I don't know if anything ever came of it.