Riddle Corner Finale! (It's Funnier Then It Sounds. Read It!)

Well, the results are in. I have not gotten a single credible result and am just ending it now.
The answer was:

Label switches A, B, and C. Turn A and B on. Wait 5 minutes. Turn B off. Go upstairs and check. If it's A, the light will be on. If it's off, you can feel the light bulb. If it's B, the light bulb will still be warm. Otherwise, It's C.

However, this would not work so well because this is a green blog, so the light bulb is, of course, compact florescent. For those reddies (the opposite of green is red, so that's what I call people who aren't green) out there who don't know what that is, I referred to it in my Earth Day Sonnet as the swirly kind. It saves energy. However, it only becomes slightly warm, so that'd make it harder to tell.

Anyway, the closest response was:
when will u tell us im curios by anonymous

I know it's a question, not an answer, but it was the only response.

Congratulations anonymous!

Riddle corner (Q1, no answer)

I am doing a new thing called riddle corner! Every so often I will post a riddle. Click on the title of this post and answer in the comments. The next one will have the second question (Q2) and the answer to here (A1). Be the first to get it right and I'll mention your name (put your name in the comment, don't leave it anonymous) Here it is:

There are three light switches at the bottom of a staircase. At the top there is a door, and behind the door is a light bulb. The door lets out no light. Once you go up and open the door, you cannot go back down. How do you find out which light switch activates the bulb. (Only one does, and this IS NOT asking how to turn the light on. Turning on three lights doesn't tell you anything.)

Good luck!

P.S. Don't answer if you already know the answer.