The Real Games, with stuff that are real sports:
Professional Wrestling, none of that sissy Olympic Style wrestling. Throw in some chairs, kendo sticks, barbed wire, trashcans, etc. Make a Hardcore match the standard. Make sure that you get Refs that don't pay attention, and look the other way when one person cheats.
Paintball, yes do it, make paintball a real sport event! Nothing says you are a pro than when you have the welts from the paintballs to prove it!
Drinking contests, see if you can drink the other guy/gal under the table.
Real US/Canadian Hockey, with lots of fights, blood, and lots of bodychecks. Allow people to throw squids and stuff on the ice.
US Football, well not NFL style, but more of a XFL style. Rough and tough, rock'em sock'em, hard hitting Football that is also a bit like Rugby.
Any others you can think of, Box?