My intention with this fort has been, from the very start, to build an artificial lake. Today I finished pouring the magma foundation of the paved rim of my swimming pool: a huge octagonal moat, 12 tiles wide, 168 tiles across. I built a bridge of steel blocks over it, rising in both directions, just to show off to any visitors that I had steel to burn. (Seriously, I accidentally forgot to add in one workflow limit and accidentally made 150 masterpiece steel maces, and it hasn't severely affected my stock.) Then, just as I was starting to build the form for pouring the water to obsidianize the ring, the siege hit, and my confidence in my plans is severely shaken.
I don't wanna give this up! I accidentally built the most fun goblin destroyer I've ever had! I just wait until the first of a pack of them sets foot on the bridge, then give the order to pull the lever, and--
BOING!
SPLASH!
SIZZLE!
Honestly, it's a thing of beauty. It's not like an atom smasher, where they just disappear. You get to see every excruciating detail, and there's no cleanup except for when the military mops up the few that get flung inside the ring and get stunned. Then I just lower the drawbridge again, and wait for the next batch of suckers. Seriously, how am I supposed to give this up, even to build my beautiful, placid castle on the water?