Looks like there's more than one
72oz Steak Challenge! The Lone Star Cafe in Ottawa, Canada has its own. The Challenge: Eat the 72oz steak with all the trimmings in less than one hour. The Prize: You get the steak for free! You lose, you pay $45.99. Can Brad finish the 72oz Steak Challenge?
From: http://www.youtube.com/watch?v=KXynfV8zl1k
Brad attempts to eat the 72 oz steak at Lone Star Cafe