One of my favorites is a coffe can full of burning gasoline. The gas makes a small fire while burning in the can but when a rifle round hits the can and vaporizes the gasoline it is most impressive! I also like the BBQ propane tanks, but for maximum fun crack the valve and light the stream of propane. Then stand back (at least 30 feet!) and blast away. The first time I did it I was 20 feet away and the fireball was too close for comfort.
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