5. USA tennis player Andy Roddick @andyroddick:

According to his Twitter, it seems like Andy Roddick has two obsessions in life: tennis and... Chuck Norris? I guess he wasn't ever very nice on the tennis court, so it shouldn't be a surprise that he would kick a dog while he's down (the dog being Charlie Sheen): “@charliesheen who would in a fight between you and chuck Norris???” And of course, Andy's always in favor of starting some intelligent dialogue: “At dinner w a good friend who's wife says he may or may poo in the nude? He's defending. We think it's weird. Thoughts???”