Years ago McDonald’s introduced a lettuce and tomato hamburger called the McDLT, where the (hot) hamburger was kept on one side of the container and the (cold) lettuce and tomato on the other. The patented container was intended to keep the hot side hot and the cool side cool. When you received your order, you would combine the two sides. The burger was similar to, and presumably a competitor to Burger King’s whopper, distinguished by the unique packaging. The product sought exclusion or at least a reprieve from the second law of thermodynamics – but physical laws, unlike those for speeders and tax evaders, brook no exceptions, as we shall see.