It isn't the best but it is the most fun when you are cruising route 66. The signs start states away "free 72 ounce steak at the big texan" and when you cruise into Amarillo, Texas, there it is. Texas shaped swimming pool, cheesy decor and all.
If you watch King Of The Hill, the episode where Bobby eats the steak to piss off his vegetarian girlfriend was based on the Big Texan. I have watched folks eat the steak and (like the hotdog contests) the skinny ones often do it.
last years results here by year
http://houseofapps.com/bigtexan/view.php
for instance John L Huey male 37 280 5'1" Murrieta, CA USA 03/29/2005