Leaning Tower of Tupperwear
Roughly fifty people and I were in a dirt pit lined with a wooden pillar wall, some of us running around aimlessly, and others playing a strange game. There was a wooden pillar close to one of the walls that went up about fifteen feet. Half way up was a wooden platform about four feet wide and six feet long, two feet above that was an identical platform with a third above that one, and above that was the ceiling of our pit (So total there were three levels to this tower.) Several of us, much more than would fit comfortably on the tower, decided to play a game. The main goal was to stay on the top level by any means necessary, and if you were to fall off, you would end up on the level below you which may or may not be the dirt floor. When you were on the middle floor the only way to ascend to the top was to reach to the bottom level and grab a conveniently placed tupperwear bowl. You would then proceed to place it upon someone's head, then they'd be sucked into it and fall off the tower. Once you did that you were free to go up to the top level. That was the whole premice of the game.