Napoleon Dynamite star Jon Heder claims his twin brother Dan is ruining his nice guy rep with fans. He told the San Francisco Chronicle, "If you meet me on the street and I say, 'No, I’m not him,' it's probably him... People ask, 'Can I get your autograph?', and they'll ask him and he'll say no and it makes me look like a jerk. They'll say, 'Whatever, you don't have a twin.' They think it's the worst excuse." Could be worse: they could be Siamese twins.PHOTO CREDIT: Sony