Game: Los Angeles Lakers @ Houston Rockets
Due in part to his larger than life personality, Charles Barkley is often mischaracterized by a modern audience as having been a true bruising power forward. At 6'6" he was hardly the prototype for a post player, but one of the things that made Sir Charles great was that he did not back down from anybody. This included the 7'1" Shaquille O'Neal, whom Barkley did not appreciate giving him a little shove under the basket after the whistle.
When Shaq then threw a punch, Barkley reacted exactly as fans would expect: he tackled the much larger O'Neal and started throwing punches before the rest of their respective teams could pile on.