ANYTHING. He even mentioned the glasses you're wearing. He even jokes about how you can kill a man with the tie you're wearing around your neck. A stick, if thick enough to penetrate through the throat. A rock. I can't remember in details about this, but he said if you strike the blow at a man's upper cranial area, then that'll knock em out for good.
i can believe all those ones but a towel?? come on dude