Mr. Sato, who apparently makes a habit out of eating things like this, called Burger King and had them concoct a Whopper with 1000 slices of cheese. Mr. Sato then proceeded to try and eat the monstrosity. His stomach hurt following the attempt.
Here are the Burger Specs:
Base model: Whopper (661 kcal/ 282g)
Toppings: Cheese x1000 (45,000 kcal/ 12,500g)
Total calories: 45,661kcal
Total weight: 12,782g
via Rocket News