You just need a small urban area like in an alley by the back of a building, a bball court, or tennis court, or whatever. Line up two teams on opposite ends of each other (like in dodgeball) , line up a bunch of shit-smeared grapefruits in the middle, a "ref" (Loomis) shouts, "Pooball, GO!", and everyone runs towards the poofruits and begins pelting each other with shit-stained grapefruits. When you get nailed, you're out. Pelt away until you have a winner.
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