all this is real good dialog and it has a definite benefit, but in your mixed bag of tricks add a heightened sense of awareness. This poor guy in the video post had no idea that this could happen until it actually did. This could be anyone and anywhere. It gives us all something to think about.
http://www.youtube.com/watch?v=OlP9-8f5YpE
He doesn't get a chance to defend himself or fight back.