The Definitive John McCain Crazy-Face GallerySRepublican presidential nominee John McCain finally made a much-belated appearance on Late Night with David Letterman last night, and he doddered his way through with his "legendary" sense of humor. He's like a grampa making silly jokes at your miserable family birthday party! And it's not just what comes out of his mouth that's funny, it's what he makes his face do—intentionally or not. Our videographer Richard Blakeley has sifted through dozens of photographs and video stills and found the best of McCain's crazy facial expressions. Some say he's on Adderall, others that he's just a weird, bemusing old dude who isn't quite spring chicken enough for the highest office in the land. We just think he makes funny faces. Take a look at the photos after the jump and decide for yourself.