Dodgeball
Credit: Essdras M Suarez / The Boston Globe / Getty Images

Tour Prize Purse: $50,000, with first place winning $20,000
Championship: Ultimate Dodgeball Championship, August 10, 2014, at SkyZone Las Vegas
Rules: Throw the ball at the other team. Don't fall down. Don't get hit by a ball. Last man standing wins. 
Odds: From 55 local tourneys, teams advance to regionals where eight teams compete in the final championship game. It's still the same dodgeball, but the ground beneath you is a trampoline.