A mighty claim to be sure! We all know about 
Denny's and the 
Clinton Station Diner's efforts, but what about those home made attempts at Supersized Burgers? The 
Homemade 96'er comes in close, but I think this one is bigger... 
This one weighed in at 120lb's, but it was for a competition, so does that count? Could this in fact be the World's Largest non-commercially available Home Made Burger? It sure looks pretty big to me!
From: http://youtube.com/watch?v=5dbJl6kYA3k
 31 lbs of cheese burger