Dwarfs chasing Crundles in the underground caverns.

Crundles are hanging on a wall (somehow)

Dwarves charge up mushrooms to get them, get vengeful, leap to attack - fall.

Remaining Dwarves won't(can't) step back, go into martial trances, start starving, die, go to rescue, are horrified, die, leap off mushrooms, die.

One of the Crundles has killed so many Dwarves by inducing suicide that he's become named.

Related bugs: Mood Spiral (Most have ongoing shock / terror and 10 doses of vengance)
Climbing Bug (They won't go down, but keep jumping to their death)

[Could this be because the top of trees/mushrooms don't have a trunk - therefore they're unable to see how to go down?]

Special Dwarves: Count Revelo - Royalty - no weapons - fighting
Farmer Void - Stuck on a giant mushroom starving to death

Jobs not being fulfilled - chopping down mushrooms, digging nearby gems, building walkways to get to floating crundles.

Weird behaviour - Weaver and others entering martial trances and then diving everywhere until they die.

Refusal - Stop attacking / Enter bunker / Eat / Drink.