I liked the Mike Huckabee ad from '08 where Chuck Norris actually endorsed Huckabee and then Huckabee turned to the camera and said "Chuck Norris doesn't give endorsements. Chuck Norris tells America how it's gonna be."
Chuck Norris once created a rock so huge that even Chuck Norris couldn't lift it. Then he lifted it anyway, just so you know who the f*ck Chuck Norris is!