Well, the final result is not a fort collapse, but still quite impressive.
The hammerdwarf went beserk, and rampaged across my crafting floor killing 7 civilians, four dogs, 2 cats and a yak before engaging the military assigned to deal with him. Assigning the rest of his squad to deal with him was entertaining, as 9 hammer wielding dwarves descended on one beserker, also armed with a silver hammer. In the time it took them to bludgeon him to a mushy paste, he killed 3 of his squad mates with head shots, broke 4 arms, two legs, and i gave up trying to count fingers. The 6 surviving members of "The Swords of Painting" are now ALL laid out in the medical wing having various degress of surgery and wound dressing in an attempt to keep them from all shuffling off the mortal coil.
Silver hammers are awesome.
And if i don't get a tantrum spiral out of this i've no idea... it may just be time for the magma pumps.
Ok i give up, no spiral, no tantrums, and to top it all off one of my marksdwarves just shot the head off a Desert Titan with a single crossbow bolt. My dwarves are epic legends who refuse to suicide.
[The Desert Titan Rithlut Nilesnum Kinkovest has come! A gigantic dimetrodon composed of salt. It has a broad shell and it has an austere look about it.]
The creature blew past all my traps, and my gate was not closed in time. A lone marksdwarf had made it to his station before the creature breezed into my entry tunnel. Placing his fate in the hands of Armok he took careful aim and fired...
The flying copper bolt strikes The Desert Titan in the head and the severed part sails off in an arc!
He beheaded a titan. With a single crossbow bolt.