This is video of a guy who was so upset about something that happened on a water polo match-up, that he knocked his opponent into the water when the two teams lined-up to shake hands afterwards.

Keep you eye on the first guy coming from the right.

Look, I have no idea what happened during the game. For all I know, the guy  could have a right to be upset about whatever he's upset about, but you shake hands to be good sports, so don't take a cheap shot.