macbook pro isight camera turns on randomly?

I have a macbook pro and recently I noticed that sometimes the isight camera would turn on (can tell because green light glows) for about a second and then turn off again. I don't use any programs that use an isight camera or needs one. Does anybody else's isight randomly turn on at random times, or do I have some type of virus that is taking photos of me? I am running leopard

It might be any security software you might have installed!!

I don't have a virus program

some1 might be hacking it no joke

Same Problem

I have the same issue. The screen will flash and the isight will come on as if it were taking a picture.