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!
I once had an interviewer ask me what happens when you type a domain into your browser and hit enter. "Use as much detail as you want."
Well, I did...
"For the sake of brevity, I'll start when the user presses the Enter key. As the key goes down, it makes two contacts connect, passing a current..."