You get your name on a plaque in the restaurant.
I agree that you don't want to fill up on bread, appetizer, sides, or anything else (all but the bread is a la carte). I sometimes think I'd like to try for it, but even the 20+ ounce steaks leave me stuffed. I will say, every bite is something to savor. My wife and I usually share a baked potato because they are huge and I do like their soup. We usually stay in either the Swan or Dolphin so we can take what we don't eat and put it in the fridge in the room. It will easily survive the hour drive home. Who knows though... I may get my name on the plaque someday.