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Here's an easy one:
there's a room with no windows, and only one door, with no window in it. There's no way to see in the room with the door closed. In the room are three lightbulbs, exposed, just hanging down on wires. They go down to your waist. Outside the door is three switches, each one turns on a different light bulb. But you don't know which one turns on which bulb. They won't turn on with the door open, and once you turn the knob to open the door, the lights go off. You can't have anybody inside the room with the door closed. How do you tell which switch turns on which bulb?
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