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 guess that makes sense it'd happen more in big buildings. The runs in most houses wouldn't be long enough to have a noticeable induced current without the electrician adding a few extra loops for fun :)
Thanks for humoring my skepticism, it's been interesting to think about how this would happen.