This is a real thing. A 40lb pizza that takes two cook to move into an oven and was made in limited orders by a New York pizzeria. It comes from Champion Pizza, and it has a charity tie-in which on the post-consumption side is probably one of the benefits. Thanks to NBC New York for this video that show of this caloric titan. 

Putting aside the New York vs. Chicago pizza debate, this is impressive in sheer engineering let alone cooking.