Nothing amusing recently.
Had one fort where the caves had a giant 3 cavern pit in them, circular in the middle of a room [God I wish I could get those caves back, they were amazing]. I had this ridiculous dwarf that seemed to have all the epicness and luck in the world. Sworddwarf. Not even especially skilled. Fights a forgotten beast around the pit, and after a few swings kicks it down in a "THIS IS SPARTA" moment. It died. This dwarf then went on to solo another 5 Titans before lag killed the fort. Didn't matter what he fought, he'd just run up to them blocking anything ranged with his shield, then instantly decapitate them. It was ridiculous.
My friend has had quite a few amusing forts though. One fort the Goblins came to attack his fort with a giant force led by a demon, all riding cave crocodiles. He had built a moat. The demon was made of salt. Demon commander charges forward on his cave crocodile, which decides it'd be a brilliant idea to swim. Demon dissolves. Entire goblin army turns around and runs.
A forgotten beast attacked his fort one time too, that somewhat resembled a Triceratops from its description. Having no military, he just sent every dwarf he had at it. 60 Dwarfs grabbed hold of literally every limb on the damn thing and prevented it from moving whilst another couple punched it in the eyes repeatedly until it died. Surprisingly an army of unarmed dwarves is actually able to defend itself.
Then there's the classic vampire forts. Someone migrates as a vampire, so he takes measures to find out who it is. Rather than kill them, he waits until the Vampire becomes Mayor, builds it its own little room at the bottom of the fort, shoves it in there as manager, mayor and bookkeeper, then walls the whole area off so that its inaccessible. His fort had no efficiency problems from then on, what with the mayor never sleeping and tirelessly working day and night to take stock of everything in the fort. When the fort was overrun by demons, the lone vampire survived, just sitting in his room counting stocks all day.
One fort he also ended up taming... Druffalos? No, I know that's not it. These big hairy cow like things found in the caverns some times. Their hide is stupidly thick. Goblins struggle to pierce it with their weapons. So he tamed them, set a few as 'guards', and every time a goblin attack came they'd just keep attacking the damn things without doing anything more than bruising the fat.
Oh, and we also had our fun fort of just caging a number of lava crabs, setting them up behind bridges in our entrance hall, and lowering the bridges when goblin attacks came. The Dwarf Fortress equivalent of a machine gun nest, and about as effective too... If you sit them in some lava.
We also did a tandem map at one point, a year each. He gave me control of the world gen parameters and the starting location. Our starting location had no fewer than 3 Roc nests [One of which was on this weird hill cave thing that went all the way from 10 height above sea level, to the third cavern layer], a Dragon, a 2 cyclops, a minotaur in its maze, a hydra, an ettin and probably more. His reaction when he first got control was priceless.