I did some reading a while back about celebrity copyrights. You can't use their picture unless it's in a news story, like in a newspaper or tabloid. But you can use elected politicians all you want for free and without permission. I'm guessing the same law applies to their name as their picture. But maybe you could get away with it by using only the first name. I think think you probably need permission to do product parodies. I think Wacky Packages got permission. I know for a fact that Weird Al Yankovic has to get permission for every song parody. I would love to do product parodies and use celebrities too, but I have lots of ideas without resorting to that anyway.