Looks booring. Once or twice would be enough. Unless, the made a soccer/football like game outta it.

I did kinda the same thing in a cement cylinder used for construction purposes. It was a little harder on the noggin, and my buddy cracked his head open a bit when we hit a tree. College parties were the best. Darwinism at it's <del>worst.</del> Finest.

I would rather get a gelatin mold that is a few hundred feet tall, and sky dive into it wearing scuba gear. Not much margin for error there.