Every morning when I warm my milk for breakfast, I put one cup of milk in the microwave (which is in perfect working order) for exactly 84 seconds. Why?
When I put the cup in the microwave, the handle on the cup is pointing towards me. My microwave has a revolving plate on which the cup is placed. After 84 seconds, the handle is again in its initial position, so I can take the cup out without burning my hands.