McCain on Letterman

I found a clip of McCain on Letterman from the Late Show last night. Letterman starts with a series of "You look like.." jokes only to have McCain come out and return fire with his own series of similar jokes. But watch closely the funniest thing is not the jokes, but the brief bit where McCain puts his hands in his pockets and does the little rock back on your heels moment that Letterman does almost as a nervous tick through out his monologues.