So I found this on the Interwebs, it's MASSIVE, but I've got no idea where it's from. If you know of any clues as to where it might have originated from, please drop us a line in the comments!
From: http://img401.imageshack.us/img401/2255/cmo255qmrc8.jpg
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SupersizedMeals.com
http://www.supersizedmeals.com/food/article.php/20070627-Massive_Mystery_Burger