This trick is silly. Take some porcelain and break it up into small rock size pebbles. Easiest way to get it like this is to break a spark plug (porcelain is the white part of the spark plug) and use that. Next, get a sling-shot. Shoot the porcelain with the sling-shot at a window, and behold the power of porcelain. The noise is pretty quiet, yet it totally destroys any window you hit. Practice it on your own damn window if you doubt the wisdom of Pvt.VVitt! Or tell me where you live and I’ll demonstrate it for ya. The result is either a spider crack or a totally shattered window, depending how hard you hit the sucker.