Quote:
Originally posted by perth
Flip the first switch. Wait about 2 minutes. Turn it off, flip the second switch. enter the room. The lit light is controlled by switch 2. The off, but warm light is connected to switch 1. The last light is controlled by 3. 
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He's good. That's the right answer.
My friend's answer was this: Turn on a switch, then leave it on for a few years, enough time that it burns out. Turn on another switch, then enter the room. The burned-out light is switch #1, the light that is on is switch #2, and the light which is off is switch #3. Sloppy, but technically ok.