I had built a wonderful vertical colony inside/behind of a massive (like 10 story) waterfall overlooking a huge crater lake. The river and edge of the lake froze every year seasonal-like.
One fine late winter day a couple were walking their dog at the rim of the crater, looking out over the lake. They just happened to be crossing the frozen waterfall when 'whoooops!' goes the dog, right over the edge of the waterfall, past the picture window in the fine dining hall, to explode on the ice below. Followed by its hapless owners (the river melted beneath them) the lake melted in the time it took the couple to fall, so when they hit the water, they lived! Only to be held down by the pounding force of the falling water until they drowned. Sadly, this was before ghosts.
but earlier,
There was a time before 3d, when one mined inward, rather than downward. My civilization had crafted a beauteous sculpture garden, on a bridge, over the raging underground river. Beyond this wondrous thoroughfare, luxury apartments housed the posh. These apartments were exquisite in every way, though they lacked a few key amenities. More on this later.
One day, a citizen fell into a foul temper, and in a fit of rage, he smashed the bridge. The bridge had been host to a sizable party that day, no doubt celebrating some sculpture or another, or honoring a decree of nobility, something. Anyway, the party fell into the river, all of em. As did the fishermen all along the other side of the bridge. But that was just the beginning.
The luxury apartments now had no connection to the main body of the fortress, which meant no booze, and no food. Further, the bridge I hastily rebuilt to help ferry the poor survivors back into the fold was nigh instantly smashed by the same, insane, dorf. After that no-one would build there any more. I never could figure out why.
The other nobles all died in their posh apartments, one-by-one. Sadly, also before ghosts.
Also, y'know, carp.