Surely it's a joke.
Obviously my question is a bit tongue and cheek but I honestly couldn't believe the size and grotesque look of this bad boy. Available at Carl's Jnr for a limited time.
http://www.hardees.com/menu/nutritional_calculator/the-12lb-most-american-thickburgerreg
A snip at just under 1200 calories in one bun. That's just under the daily suggested calorie intake for a woman.