I think, although he was already angry with the match in general, it was that last point which pushed him over the edge. For those that didn't watch on match point Verdasco was battering the ball but Simon kept getting back playing great defence and then Verdasco just hit too long.
A good workman never smashes his tools
Champions deserve whatever they win playing within the laws of the game
Perfect picture. He did it with real passion...the way it should be done! I have always thought that instead of warning players for doing that, it would be cool for the umpire to take the racquet and give it to a young boy or girl in the crowd instead.