I shaved half of my hair and half of my beard so that I'd have an interesting driver's license, and posted the photos on Reddit. So I can't really complain about someone else appropriating my image. But it did get big in a way I didn't expect.
My mother found out when she went to yahoo.com to log into her email and I was on the front page. My father-in-law was watching the local news and saw me giving an interview. Two years later, I can bring out my driver's license at parties and people remember it. But they don't remember me, just the photo, so no harm done. (And happily, my domain has enough precidence on google to at least appear first for searches of my name).
On the upside, if I ever meet Greg Proops or Ellen DeGeneres in person we'll have something in common to talk about.