Q: Every morning when I warm my milk for breakfast, I put one cup of milk in the microwave (which is in working order) for exactly 84 seconds. Why?
A: When you put your cup in the microwave, the handle on the cup is pointing towards you. Your microwave has a revolving plate on which the cup is placed. After 84 seconds, the handle is again in it's initial position, so you can take the cup out without burning your hands.