So my friend and I were hanging out, and she had this riddle for me. You know, those crazy "this is what you have, how do you figure out x?" riddles you and your friends go through late at night. Yeah, its one of those. I suck at them. She never told me the solution so I'll present it to you guys. Mind you, I don't know the answer, so don't ask me if it's right or not. So you have two rooms. One room has a single light bulb dangling from the ceiling and its not on. The room next door has 3 switches, all of which are in the "up" position. You basically have to figure out which one of the three light switches turns on the bulb in the next room, and you only get one shot to check the light bulb to see if its on or off. How do you do it?