I wish they weren't so smart, actually. We spent forever making them really smart, and probably the last few months making them dumber, because they like to go off and do things that really mess the world up. A few weeks ago there was an instance where a player dropped the "Skull of Corruption," an artifact that when used on an enemy makes an evil clone of that enemy. He was just testing and wanted to make sure the object used the physics correctly when dropped. So he drops it and an NPC runs up, grabs it, and shoots the player with it—creating an evil version of the player who starts killing everyone. It was hilarious.