Okay, friends, here's a new one. I will try to be as clear and as explicit as possible to keep the question from being ambiguous. The setup. You are in the basement of a house looking at three light switches all in the off position. Each switch is connected to one 100 watt, 60 watt, and 40 watt light bulb, respectively, in the attic. You cannot see the attic or any of the lights from here. The question: How can you figure out which switch goes to which light, if you may only go up the stairs to the attic one time?