Pretty funny walk-on on "Late Show with David Letterman" last night by John McCain. Dave starts off the show with a battery of old guy jokes about McCain ("he looks like the kind of guy who has wiry hair growing out of new places...the kinda guy who goes into town to buy turpentine...") and then McCain walks out and delivers as good as he gets. Why tell you, though. (It all gets lost in the translation.) Here's the clip, gratis CBS: