OK, i was building a tower when i ran out of bricks, so my roof was a bunch of random colors, later i made this massive mine and then i had way to much rocks, and useless stuff, so i decided since the roof looked ugly, i decided to get rid of it, i marked the entire roof for deconstruction, and then went to the Jon, (bathroom) when i cam back, i found i found around 6 dwarf dead, and the rest wounded, and because my Hospital was ill prepared (did not have enough beds) we moved everyone we could to the hospital, and left the rest at the barrek (cause it was the closes bed available). well everyone at the hospital died of infection, and dehydration cause it was winter and i still have yet to master the "well" and i only had 3 soap, but no body was using it..., mean while while everyone was dyeing cause 2/3 of my doctors was injured/(to be dead) back at the barrack, my injured Hunter (who is legendary marksmen, ambushes, and hunter) died of no food... and he wasn't even infected. so in the end with the account of all this death and tantrums (that continue after a lot of other people died) around 15 out of 50 of my pop died, and i was saved from the tantrum spiral by locking everyone in there own rooms, with lots of pretty statue... some of which died of dehydration cause i forgot about them.
it took me around another 2 years to finish replacing the roof and because my 2 hunters died in the... accident... i made random people hunt (even though i didn't really need but the wildlife was annoying) and a few of them were mauled by a grasshopper man.
so with my Cemetery full, and my population finally under control with only 1 or 2 people felling sad in and out, i did a face palm at the end of it.