"...The repetition is eased by the so-called "AI Director" -- an omnipotent figure watching silently from the shadows, who creates dramatic tension by conjuring health and ammo at the points when you need it, and a billion zombies whenever he's bored (which is all the time). Anthropomorphizing the system was probably a shrewd idea, because when cocks rocket skyward, everyone likes having someone to blame who can't defend themselves. I saw someone pray to the AI Director once; this is probably how cults get started!"