Found this one on Flickr.... If you can read Japanese, and know what it says, or know where this place is, please let us know in the comments! Would love to know where you can get one of these!
From: http://flickr.com/photos/derektor/25429131/
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SupersizedMeals.com
http://www.supersizedmeals.com/food/article.php/20060907-Japanese_Mystery_Mega_Burger