Playing on Masterwork mod on a gnome fort, but I think what happened still deserves a place here:
I was just about to abandon the fort for FPS death, when a titan arrives. A stone quadruped with horns and "joyous movements", or something similar. He immediately rushes to my fort, goes through a passage in the walls I forgot to seal up, smashes my military in a couple of seconds and then proceeds to turn every person in my fort into a flying projectile, usually heading towards a wall or into the well. When the 184 people in the fort have been reduced to 24, the beast faces my war beasts, who manage to injure it; then, my only miner left lands a lucky hit to the head, finishing it off.
The fort is a total mess, only 3 of the people left are (almost) sane adults, and two of them go insane and depressed almost immediately, together with about half of the children. The one guy left does some work, until a couple of tantruming children give him just enough injuries to force him in bed.
Meanwhile, one of the unconcious citiziens does the only thing possible at the moment... becomes mayor and claims the former mayor's room.
At this point, all the children are going insane one after another, fighting against each other or walking around aimlessly.
And then, a caravan arrives.
The diplomat proceeds to stand next to the mayor, which is passed out in his bed, with his head completely smashed.
So, now I have 7 children alive but totally depressed and on the edge of madness, 5 other children and 2 adults struck by melancholy, 2 dwarves in bed, without any possibility to recover, no food, no drinks, and a caravan waiting in the middle of the miasma, standing on top of dozens of body parts, waiting for the traders.
And, I almost forgot, the other guy in bed, who isn't unconcious, is throwing a tantrum. He can't walk, hit anything or move in any way...
So, this was fun. Off to the next fort, then!