At my school we have a rope swing that goes over a very deep gully. (40 feet) I have gone off it many times as well as my buddies. One day. Kevin my buddie some how lets go and falls, 40 feet. He had to fractures in his spine* and broke his collar bone. The shock on his face after he woke up on the ground was funny. Meh, He is alive.

*you know how your vertabry(sp) is like a little cup thinggy he broke the one side off of 2 of them.