You are trapped all alone in a police station.  It’s infested with zombies, mutated dogs, and practically anything else that wants you dead.  After long hours of fleeing for your life, you take refuge in a room that appears safe… at least for now.  There’s a golden cogwheel embedded into the wall that you must retrieve, but how do you get it?  Looking around for a solution, you see a furnace and 3 adjacent faucets.  You decide to light up the furnace, and turn each of the faucets.  Immediately, a faint clang in the distance signals that the cogwheel dropped to the floor.  As you approach the cogwheel… BOOM!  A hulking monster in a trench coat bursts through the walls.  It looks at you with one goal… kill.  Immediately taking aim, you empty countless clips into this beast, but it’s still inching nearer and nearer, trapping you in a corner.  Finally, as you fire your last shot, he falls down motionless.  You let out a sigh of relief, and retrieve the cogwheel that you came for.  Leaving the room, things appear peaceful again as you are walking into the hallway.  Until…. BOOM!  The walls come crashing down.  Through the smoke appears the same monster you just put down.  It’s staring you right in the face… yet again.