I Love You, Monster!

Hi, I'm a lamp. Yes, just a lamp, but I have one thing in particular. Every time when someone flips a switch, I turn on a light. -What's so special about that? That's what all lamps do. Yeah, but there's a trick to it. I turn the lights on in different places, in different people's houses. And every time I get the same question. What the hell am I lighting?