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!
Take the cover off, flip all three switches. Whichever terminal shocks you is completing the circuit for the light.
What if there are other things wired to those switches?
I'll be sure to revisit this question, if I ever find myself retreating to square one, mired in my own ineptitude. For now, there are three unlicked terminals before me.