My favorite part is Almagaro coming over to check him out, sure that Youzhny is faking just to get a rest. Then it suddenly dawns on him, "Dude, you hit yourself in the head with your racket." By the way, Youzhny went on to win; but he was ousted from the tournament yesterday.
Youzhny Vs. Almagaro [Youtube]
Here's another clever take on this.