I have spent the last 11 game-years building a dwarf metropolis. It has a magma pool complete with smelters and furnaces. It has a plentiful supply of gold, silver and copper. The king has arrived, and installed himself in his throne room. The elves are fat, drunk and happy.
But it's getting boring.
So I am opening up this fortress to the community to come up with interesting ways of destroying the fortress in a spectacular way.
Flood the map with magma and set all the dwarves on fire!
Open up the main gate and invite the goblins in!

Do whatever you want, just post the tragic results at the xkcd thread (click "Visit Homepage" link)