That's freaky. I had that exact same idea in my mind for years when I was really little. I thought it would just be a matter of finding people strong enough who had the same idea.
Hoy vay i had that same idea when i was a kid and i tried it with an elevator in our building and broke both my legs me and a friend of mine.I remember as a kid thinking if you jump out of an airplane right before it hits the ground you'd be fine.
:_)