Baahahahaa!In my new fort (which is going pretty well) I've had three moods so far, all of them on metalsmiths.
Now, not having an anvil, and not being able to afford the steel ones the dwarven caravan brought, they've all gone insane. The first guy went berserk right next to the wagon (I've since built a meeting hall, don't worry) and the nearest miner knocked him unconscious with a blow to the head, then hacked the dude's head clean off. Brutal. Turns out giving my miners fighting skills on embark paid off...
Anyway, the next guy just went insane and died of thirst, but the most recent guy went berserk as well.
And because all my idlers had moved inside to the new dining hall, the first thing this guy saw to attack was... a grey langur in the corner of the map. I'd actually had my military out killing the damn things at the time, so this was a fluke.
So I order all of my fledgling military to charge over there and kill him with their training weapons. They run over and start battering him ineffectually with their wooden weapons, whilst he's still beating the crap out of this langur. This goes on. And on. And on. Eventually people start passing out from exhaustion. The langur dies at some point, no-one really notices. They're still flailing at this guy with their sticks. I think, "What the hell, at least this is good training for 'em!"
And so I let it continue. Eventually, the troops are getting thirsty and so some helpful soul leaves the dining hall, grabs a bucket of water and heads out there. He approaches the melee, I have a chuckle seeing the bucket he's hauling and realising how long this has been going on for, then suddenly he drops the bucket, sprints over there, and lops off the berserker's head with a few strokes of a copper pick.
Whoops.
So much for the prolonged live training session.
Tl;dr: Fun with berserkers.