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!
It's a silly riddle that, for some reason, has stuck around in my head for decades, I think from an old tv show (anyone else remember Crashbox?). I remembered the answer immediately. So, this would be less of a test of my reasoning/problem solving skills, and more of a test of my ability to find and store vast amounts of useless trivia and instantly recall it decades after the fact. If that's what you're hiring for, I'm your guy!