Had one 2 days ago that was so stupid i made an account here just to document it
To provide context, Claspfactions, first fort that actually got anywhere without me ragequitting due to something going wrong in a dumb/obnoxious way (i'm a huge noob and have no patience lol), still suffering from fallout of first siege which was a pretty bad massacre causing the survivors to suffer massively from stress and depression, was slowly getting back up and installing useful things to boost morale.
Eventually a second siege arrive, for the most part, not a big issue, for immediatly after barely surviving siege one i had set up a new invader hall with a series of atom smashers, the goblins are trapped, the smashers are activated on repeat, they get wiped from existence.
the invader hall and main entrance are both opened again, and fortress operations resume as normal, a library and temple are getting constructed, and a tunnel is set leading to the caverns for trapping a FB inside our invader hall to serve as a spittle turret
things run smoothly, until i see a missing dwarf message, at first nothing too alarming, figured it was an insane one that wandered off somewhere to die (dwarves falling into depression was fairly common by now), until i get another one, and another one, and another one...
at first too confused to really do anything, i press the units key and realise my population had crashed from 80-something dwarves to a mere 13, with 7 of them in perma-rest due to injuries, i start panicking, wondering what in Armok's name was happening
...then i look up at my invader hall
i had forgotten to turn off the smashers who were still triggered on repeat by a idling dwarf, meaning i was atomizing my own populace the entire time
soon after, my FB trapping attempt fails due to a dwarf taking too long to press the lever for the trap (one ****ing tile away from the bridges closing in time) and me lacking the planning to add "buffer" doors so this isn't an issue, and the FB kills off my remaining able dwarves, and after a huge fight with the horde of tamed dogs in the fort (who put up a lot more of a fight than i figured, the FB was in a really sorry state after that, but the thing refused to actually die), Claspfactions falls, and surprisingly, despite the frustration, i don't mind that ending, it wasn't what i expected for a fall of this fort, but the idea of a ancient monster getting swarmed by dogs and tearing it's way through them is pretty metal.
TIL that Losing is more Fun than living on forever as a defacto asylum