My fortress is currently recovering (maybe) from a disastrous tantrum spiral and my Baron went into a fell mood and took over the butcher's shop. I wasn't paying much attention, since there was a goblin siege going on and the lever controlling the front door has gone missing

but anyway, the next thing I know, the Baron has apparently grabbed a nearby ghost and dragged her to the butcher's shop where he slaughtered her to make an artifact from her corpse!
Maybe this happens all the time, but its the first time I've ever seen it, and I thought it was hilarious!
UPDATE: He made a dwarf bone spear called "Cradledied The Unnameable Blight." It has an image of salmon in dwarf bone.