This idiot was fouling up the party vibe during SXSW down in Austin by trying to pick fights with the crowd, until someone stepped up and shut him down... with one punch.

Some might say it was a "sucker-punch" that knocked him out. I say "So what"? The guy had it coming... he actually struck a few people, and the guy in grey did what needed to be done.

I don't know what is more embarrassing for this guy... that he was knocked out with one punch, or that the police arrested him and hauled him away in a golf cart... watch.