Hell, imagine running down a completely dark hallway towards an open doorway to a lit room; you get within a yard or so of the door, and then, suddenly, this...thing appears from the corner to greet you, the lights from the other room silhouetting her figure before her twisted, monstrous, and strangely comical form reveals itself to you, jaw agape and eyes burning into your soul. Then she spits on you violently enough to send you shooting across the hallway in both directions; her that sound? It's the Infected, rushing in droves and hungering for your untimely death.
I'm getting this game.