I'm putting together a "Dirty 30" party for my wife's 30th birthday next month. We are creating a mud pit, probably something like 40' wide and 60-80' long, and I'm looking for ideas for games we could play in there which would get everyone pretty dirty. Things like 3 legged race, etc are what I'm after. I'm putting down 8-12" of clean sand, so we'll be running around barefoot. There'll be around 40-50 people which we are also feeding, so any ideas would be appreciated! I looked around on Google, and most of the "dirty 30" things were sexual. We're keeping it clean, I guess you could say.