Dwarf Fortress: Full of Fun

Discuss what might be the most complex civilization-building fantasy simulator game ever. Share your thoughts, grand tales, epic failures, and all the other fun stuff in the game.
For those who don't know what Dwarf Fortress is, you can get it free here.
I haven't been playing this game for very long, but I've really enjoyed it so far. It is very complex, with all the menus within menus, strange systems, and more. I like its complexity, though. It makes for a very interesting game.
So yeah, that's all I've got for now.

Oh my god this game is fantastic xD One time, my whole city became zombies (Necromancer) and one child was still alived. He ran into the zombie horde and killed seven of them with a butter knife before he died.