I did a few shenanigans here and there. Most were just weird things though.
I do remember accidentally making a command attached to a room that would essentially delete your inventory if you were a wizard because it turns out there was an admin command with the same name. And another that would fill up your inventory with undroppable items.
Oh, and I can't forget the rooms that moved you automatically between them in a circle so fast that you had to spam directions and hope you exited to a room that was outside the circle of spinning rooms.... it was supposed to move you from room to room every 2 seconds or so (to simulate a giant spinning gear in a clock tower), not every .2 seconds or whatever it was doing... whoops.
Then again, I suppose I should have actually learned C before monkeying around with LPC... this was back when I was in my early teens and my only programming experience at that time was BASIC.