I saw a guy in a bar once who had one too many drinks and refused to pay his tab. When they confronted him about it, he went apeshit and started taking swings at random people. He also threw an empty beer bottle into the wall but didn't manage to hit anyone with it. A couple of people got him under control and held him down til the cops got there. Pretty quick response time on the cops too...I'd say the whole thing was over in maybe 5-10 minutes.
Luckily, as far as I can remember, that's the most violent crime I have personally witnessed.