I learned from an old drill sergeant -- used to be a mule skinner back when the US Army used them regularly. He got into a cussin' match with a visiting CPO off an oiler and Marine Gunnery Sergeant who'd spent ten years on the China Station.

The sky turned blue and then dead, dead black. Barracks and power lines and even a drill field were knocked down in all directions. Finally, there was an immense flash of light and the entire impact area they were cussin' in exploded. Left a crater of God alone knows how many acres. Eventually the crater filled with water and became what we now call "The Great Lakes." I barely escaped with my life.