The first time I set up a hospital, a dwarf got injured and OMG. IT ACTUALLY HEALED. (this being shortly after my first successful military.) Honestly, I checked up on that dwarf like 6 times (totally unnecessarily) to see how it was going. And may have nicknamed it.
Also, watching hunters kill stuff.
More recently, first evil "fort". Died really quickly, but my dwarves tried pretty hard. Started a nice entrance, then suddenly, zombie yaks. Dug straight down, ended up making a jagged tunnel (I canceled the dig designation halfway through) just above the aquifer, made an extremely untidy little area and channeled away the spot in-between so it filled with water in the hopes it would slow them down. For some reason they didn't want to pass it, so success. Had to make another entrance to let the others in. The miner did a lot of risky stuff and killed some of their zombified dogs. But everyone got thirsty because it was too scary for them to drink.
Worked at a cave-in so I could get them some food, but the wagon was parked RIGHT next to a murky pool. So, made a way to drain the pool to figure out if I could cause a cave-in from beneath to get the supplies, but they got in and everyone who had survived that long left through the murky pool to do whatever insane thing they had decided. Facepalm.
So, everybody died. The Expedition Leader was the last, I put him in a squad all alone and he suicide-attacked the yaks although he didn't damage them at all.
Most Fun embark I've had.