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For years there have been urban legends about a "brown sound" or "brown note," a frequency so low that it'll literally cause you to shit yourself. Not only has this elusive weapon been sought by governments, but it also crops up in science fiction. Just think about what this insidious weapon could do in the hands of an evil villain! It turns out the legend was born after several real-life tests of the Republic XF-84H "Thunderscreech" airplane in 1956, which earned the honor of being the loudest airplane ever built. Find out more about the poop plane and the quest for the sound of brown inside. More »
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