Several times, never anything really serious however.
Worked as a bouncer for a nightclub for a brief period, had a few episodes there.
Besides that I have two mates in my friend circle who really change their attitude when intoxicated.
They are both great people when sober, but they get really aggressive with alcohol.
Its not like they will attack ppl they know but they will pick a fight over anything with anyone(thing) they dont know.
On one occasion it took five police officers restrain one of them
I have only ever started one fight on my own (and not joined into one to help friends/been attacked).
And that was in the military strangely enough. The last day of boot cap our commanding officers (younger than most of their recruits) did everything they possibly could to make our lifes as sour as possible before we left. One of them singled me out and well.. I just snapped and gave the drill sergeant a pounding.
Felt really really good. Expected to get disciplined to hell for that but no, the mp agreed that the sergeant was going over the top + it would be difficult to carry out anything as everyone was supposed to be moving onto new assignments.