I'm fiddling around on a moo.
Not knowing that $room has a special meaning, particularly when invoked by a wizard, I stupidly use it in a verb I'm writing to find the room number of something to send a player to.
This caused holy havoc with the @dig command, which I first noticed when I dug a room and found that it was the exact identical to a room I had been playing in all afternoon -- particularly in regards to said verb I was writing. And every time my verb was ran, the number that $room is supposed to point to, the generic room, was being changed to other rooms on the mud.
But...thankfully, I figured out how to fix it, so I'm better than I thought. :)