Went to a fight and a hockey game broke out !!

[keithting]

Or watched a MLB playoff game and a football game broke out....

Was it a slide or a tackle?

Rule 7.09:

It is interference by a batter or a runner when --

(e) If, in the judgment of the umpire, a base runner willfully and deliberately interferes with a batted ball or a fielder in the act of fielding a batted ball with the obvious intent to break up a double play, the ball is dead. The umpire shall call the runner out for interference and also call out the batter-runner because of the action of his teammate. In no event may bases be run or runs scored because of such action by a runner.

Pretty clear except to the umpires at the game last night. Nothing "clean" about the slide at all...