On the topic of big bangs...before I moved away from my small Iowa town there used to be a couple of guys who were in the business of cutting up all of the underground steel gas tanks that were removed from gas stations. They would remove all of the manway fittings and rinse the tank with detergent and water, then cut the tank with an oxy/acetylene torch. Anyway, they had a pair of tanks sitting in the yard and had washed one out the previous day. Apparently when the first guy showed up the next morning, he forgot which one was clean and cut into the other one. My high school was about 3 1/2 miles away and the ground shook when it blew up. Supposedly there were somewhere around 160 windows blown out of houses and businesses in town. The guy survived but he is completely deaf and never leaves the house to this day.