Most unsportsmanlike event in sports history

Has to be right up there.

Wonder where Gilooly is now?

I would say potentially exposing other divers to HIV has got to be up there.

That was just dirty cheating.

I consider the Pistons walking off the court after being swept by the Bulls in the 1991 playoffs without bothering to shake hands with the Bulls or acknowledge them in any way to be among the worst unsportsmanlike events in history.

Isaiah Thomas, who led the "walkoff", apparently regrets it now.

OJ murdering his wife wasn't very sportsmanlike at all

Maybe not the worst but worthy of mention:
Saints fans cheering when Wade Wilson was lying on the turf with a hurt knee during a Monday Night Football game. Pretty embarrassing when fans are cheering the injury of their own QB.

Whoever carried a gun into the college stadium and shot an Auburn defensive player. I mean he/she shot a student athlete who doesn't make any money. It also didn't affect the outcome of the game in any way.

BIRMINGHAM, Ala. - A woman charged with killing a fellow Alabama fan after the end of last weekend's Iron Bowl football game was angry that the victim and others didn't seem upset over the Crimson Tide's loss to archrival Auburn, said the sister of the slain woman.

Clemens throwing the broken bat at Piazza.

bizarre.

intentional though?