1) Aren't thieves supposed to ignore rocks? Since, you know, they're worthless?
2) Cats = emergency food. Embrace it, believe it.
3) That's very odd, I've never seen dwarves stop working and just stare at it forever.
4)lolcoins.
I've trapped Titans outside my fortress by locking a door in their face, which shouldn't work because they are building destroyers, so they should be able to just knock it down.
I've had dwarves take breaks in the worst of places at the wrong times, like the aqueduct that was supposed to fill a giant cistern for a flood trap. The water started flowing, UristMcMiner was never heard from again.
One time, a troll ran up from the caverns, knocked down all the doors in it's path, charged up the stairwell into the fort (being chased by various war animals, such as dogs, elephants and Tigermen) ran out through the main corridor (spooking some merchants while he was at it) and charged off the edge of the map from the surface world.
And this, children, is how
the internet goblins found the first trolls.
EDIT:
Link to the game?
http://www.bay12games.com/dwarves/Hope you like ASCII and a learning curve sharper than any other game in existence!