This wasn't any barfight caught on tape. An angry man pummels a much smaller female bartender. As it turns out, he's a Chicago police officer and late Tuesday night he was taken into custory [sic].
Chicago--isn't that where "The Only Ones" will arrest a citizen who they find with a handgun?
[Via Cryptic Subterranean. I've also gotten links to other reports on this story from Paul G, and got this one from 45superman.]