The worst NBL incident was a few years ago, here at The Powerhouse (as it was back then).
WE were playing the Kings, back in their "choker" days, and I think they managed to beat us.
There had been a few minor skirmishes during the game, with Rees, Cattalini, Heal and Nielsen being the main catalysts (when Neilsen was that very young hot head he was known for).
The marketing department had wisely got all these little computer shaped stress balls, which went into the corwd during the game. End of the game, Nielsen was pelted with a few of the balls, and he promptly retalitaed with a nice little finger gesture.
Also, probably the incident with Melbourne owner Seamus McPeake, and the FOX camera, and the finger to the cheersquad a few years back is probably a note worthy one.