I can remember my brother finding some sort of black powder in our basement or somewhere (maybe he broke open a whole bunch of firecrackers, it was quite some time ago). He decided that it would be a good idea to pour a line on the ground and light it and watch it burn across the ground (like in the movies) to a bigger pile not too far away. His plan was to light, step back and watch the big poof.
His eyebrows did grow back and he never tried it again.
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