Draft a dwarf who has no fighting skills, preferably one who hates certain very easy to find vermin. Station him in a room with a bunch of levers and a food stockpile (no booze, but instead a water flow, not a well) set to only include raw foods (plump helmets, etc.). Set these items to not be cooked, so you don't accidentally take them from the stockpile to cook them. Lock him in, and have a glass window looking into a room where the guy's pets are placed. Kill the pets.
Trap the vermin that he hates, add them into an animal stockpile. Don't give him a bed. Make sure everything is of the lowest quality: Doors, levers, barrels, etc.
In the room will be dozens of levers that will be wired up to several small traps throughout the fortress. And by small, I mean things that will not outright kill your dwarves, but may injure them, or kill only one or two at a time.
As a few good examples:
Menacing spikes in the grand hall.
Reroute magma/water to personal bedrooms.
Cave-in at a workshop or food/booze stockpile.
Release megabeasts from cages in the fortress' zoo.
Stones on floor hatches, to be dropped on unsuspecting dwarves below (grand hall or bedrooms preferably)
Use screw-pumps to ensure single-tile magma streams down the grand hall.
Use your imagination for anything else.
Try to piss this one dwarf off as much as possible, and when he finally breaks, if he berserks, he will pull any or all of the levers randomly. Watch the chaos unfold amidst your fortress. Any survivors are likely to be caught in the fallout of a massive tantrum spiral.
Watch the fireworks.
If the dwarf doesn't berserk or instead goes mad or melancholy, drag another dwarf down there.