I'm not gonna tell you how I know this, but if you take an oxy-acetylene torch, get a good cutting flame going, tap the tip against a flat piece of steel to snuff the flame, wait a few seconds to let the tip cool, then stick it in the mouth of a baloon, fill baloon, tie it off, put the baloon in a paper sack, put the sack in the middle of an intersecton, set the bag on fire, and run like hell (VERY important), you can break windows on all four corners...