Structural engineers have this thing called the bridge formula that they use to determine how much weight a bridge can bear*. Whenever I heard our engineers talk about the bridge formula, for some reason I always thought of a recipe -- you know, something along the lines of Julia Child doing a show dedicated to single span arches. The humor in this one is aimed at a certain demographic, so don't worry. If you're a bridge engineer with an affinity for French cooking, you'll be totally ROFL. Trust me.
*Calvin's dad totally lied on this one. They don't keep driving bigger and bigger trucks over a bridge until it collapses and then weigh the truck. That'd be silly!