Fun stuff from the few most recent pages in Dwarf Fortress bug tracker:

Human civilization's soldier is an Alligator Recruit.

Dead suspects confess to crimes

Crash due to zero-size weasel

Pets and other animals from retired fortresses appear as selectable 'workers' in request screen, die of old age on arrival

Some animal people have extra fingers

People dying twice?
Most confusingly, one necromancer shows as having died from old age twice, despite this not being possible.

My Nature Hating Adventurer Who Lacks Altruism And Is Very Cruel Isn't Happy After Butchering Animals

bat man males don't have geldables

Reanimated severed werebeast necromancer hand has a full body

Dwarf likes "cacao wood wood"

Dwarves turn hostile againt the player and defend their prison from raid sent to free them

Visitors giving birth during visit leave their baby behind

a water buffalo got stuck inside a rough tetrahedrite wall

Animals which retract into body parts forget to come out

Herbalist stuck on stepladder, starving to death.

Artifact has an image of nothing

Cave Dragons are sometimes intelligent, and sometimes join human civilizations

A goblin knocked over a workshop and now my dwarves are killing each other

Ambusher elves are being spotted, but the giant monsters they're riding on aren't.

runs with food from table to table. Can't eat

Intelligent Undead Sent on Mission Return as Ghosts

Horrified merchants immediately destroy their wagons, pack their goods and leave the depot

Dwarf king abdictates to become commoner necromancer apprentice

Internal body parts with certain tags can still wear clothing & armor, without being otherwise accessible

Necromancer marries zombie

Single dad dwarf with buggy dead wife leaves kid behind when he takes over holding

Large quantities of adamantine coins causes trade depot to burst into flame