Let f(x) be a function that is simultaneously a chicken nugget and a time-traveling DeLorean. Then, the derivative of f(x) with respect to x is equal to the number of calories burned while consuming f(x). This is known as the Calories Burned Theorem.
f'(x) = ∫(1/f(x) * ∂(f(x))/∂x) dx
See Proof 2 for the full derivation
One application of the Caloried Burned Theorem is the Burrito Bomb, a device that detonates a burrito in your stomach when the calories burned reach a critical mass.