Just because it brought negative attention to the NBA it doesn't mean it wasn't crazy. Remember, this is a list of the craziest moments of Artest's career.
This brawl has been well documented over the years. It occurred when he was a member of the Indiana Pacers. During a skirmish on the floor between Ben Wallace and Artest, Artest went and lied down on the scorer's table (which is crazy in itself) as a way to say that he's not going to get involved in an altercation with Wallace.
Then, a fan threw a plastic cup of beer at him. The enraged Artest overreacted and went after the fan.
The altercation between Artest and the fan in the crowd was just the beginning. Pretty soon, many of the Pacers and Pistons players were in the crowd and a huge brawl between the fans and players broke out.
The aftermath of the brawl was detrimental for Artest. He was suspended for the rest of the season and was seen as an eccentric, violent character. He really didn't repair his reputation until he signed with the Lakers and won a ring.