Post:
You have three switches in one room and a single light bulb in another room. You are allowed to visit the room with the light bulb only once. How do you figure out which switch controls the bulb? Write your answer in the comments before looking at other answers.
Comment:
If this were an interview question, the correct response would be "Do you have any relevant questions for me? Because have a long list of things that more deserving of my precious time than to think about this!
Grab the bulb and bring into the room with you and replace it into a light fixture in your switch room. See which switch controls it. If this doesn't work, retrieve the bulb and answer with "currently none of the switches control it."