I tried flooding my fortress, sent 5 Urist's into a room and walled it off then tapped into the brook right next to the food supply on the top floor. The water was incredibly slow so I decided it'd be a great idea to dig a ramp under the river too, after about 5 minutes of tortoise speed flooding winter sabotaged my plans. I sent my miner to dig more space for the river and dig through the river, little did I know he was the only miner outside of the dry room and digging through a frozen river would cause it to freeze up and swallow the occupant of the tile.
The water levels in my food and drink stockpile was too high for my dwarves to wade through and everyone was so dehydrated and starving a few went insane. In the lower levels where the sleepy rooms are there were 3 dead dwarves and maybe 5 insanely dorfy dorfs, the lower levels filled up with miasma and prone-to-die dwarves just crawled into it. Each one was murdered by the suspiciously miserable murderers. One of the dwarves, a trader, tortured a baby until it passed out (broken bones, bruises, etc.) then with a blow to the head put it out of its misery.
I checked on my survivalists and it turns out I forgot to put food and drink in their box, a few were already joining the lower level murderers, punching and biting the cats, dogs and children. A trader came, unaware of the dangers below and just sat up top waiting for whatever traders do (steal corpses? Gosh, I don't know.). Soon after, only 2 survivalist dwarfies were sane and alive. The miasma in the box got the best of them and insanity once again peered into the souls of the innocent.
After all the crazies were dead and the box pals became crazies I decided it's time to abandon these fools and start again.
The only thing I have learned is that success is boring.