I would say that if you walk over to your opponent, grab his cue, and break it in half while yelling "you don't deserve a cue!". You might be taking it a little too far.
Seriously though, how many posting here jump up an yell when you see your favorite football team win ONE game? If a football team wins the superbowl, you usually see riots in the streets.
Why is it deemed perfectly acceptable to show emotion in football and other sports, but not in pool? People constantly complain that they don't want a bunch of robots playing pool, then complain when a little emotion is shown.
When was the last time you saw a player show a lot of emotion for winning one match in a tournament that wasn't the final match? It's pretty rare for that to happen. So, the emotion is being shown at the end of the tournament. That's equivalent to a mini-superbowl in football. If you can't show emotion then, then when can you?
Fans in football see no problem with jumping up and down and screaming when their team wins a game, and the person showing the emotion wasn't even playing at all. Yet, the same person finds it distasteful for the person that actually won the whole shebang to jump up on a table? Doesn't make any sense to me.