How do I figure out what my light switch controls?

There is a light switch in my apartment that seems to have no purpose. I can't figure out what it is for. I've tried every outlet in the apartment to see if switch is for one of those, and it doesn't control any of the lights. Is there any way to find out what it is for? I'm thinking maybe it's... show more There is a light switch in my apartment that seems to have no purpose. I can't figure out what it is for. I've tried every outlet in the apartment to see if switch is for one of those, and it doesn't control any of the lights. Is there any way to find out what it is for? I'm thinking maybe it's for an outlet and maybe just isn't working properly. ( I don't want to end up like Monica on friends and start tearing holes in the wall, but it's driving me crazy!)
Update: there are no neighbors, just a business on the bottom floor
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