It was a YouTube moment that went viral in a heartbeat.
Oregon Ducks' running back LeGarrette Blount sucker-punched Boise State defensive end Byron Hout in the jaw after the Ducks' 19-8 loss to the Broncos.
Hout had yelled and tapped Blount on the shoulder pads in celebrating the season-opening victory, then turned away.
Then, as Hout was talking to a coach, Blount blind-sided him and knocked him to the ground.
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It cost Hout a sore jaw.
It cost Blount his college career.
After slamming Hout, Blount had to be restrained by police from menacing the crowd that was watching in the stands.
Oregon coach Chip Kelly, after consulting with school officials and the NCAA, suspended Blount for the rest of the season, including bowl games.
Since he is a senior, Blount won't play again at Oregon.
He is said to be stunned by the decision.
He's lucky he did not lose his scholarship. He will be allowed to work out with the team.
Trash-talking and celebratory prancing are to be expected in football games.
Oregon, by ending the college career of a valued player, demonstrates that anything beyond that is over the line.
It's a tough but proper lesson.