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!
You can get a 66% chance of being right if you turn on a switch and check the room. If the light is off you guess between the other two. For example, you are going to test switch 1 and if it is off you guess switch 2.
Reminds me of the Monty Hall problem except in that problem the game show host has an action to take which effects the odds.