Gettin' they mind right..
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When I was a kid living near Peshawar on a U.S. ground control installation for U2 and RB57. I watched some airmen trying to smoke a hooka. They got it filled with water, a tiny pebbel in the right spot, tobbaco in it and lit. After passing the hose around for a few minutes the top exploded like a firecracker. Seems they used the wrong kind of pebble and some stones fracture violently when heated. But, then the airman who got it from a vendor in Peshawar was given the tiney pebble by the same vendor. Good practical joke if you survive........Maybe the gentelman in the picture knows something.
