Yep, there have indeed been documented instances of the most metal thing ever -- blowing out the lungs of your audiences with a bitchin' solo. It's called pneumothorax (which, incidentally, is a hell of a name for a metal band), and it's a fancy sounding term for having your lungs bassed so hard that they explode. It really only happens when oblivious or masochistic fans stand directly in front of the speakers. But of course we couldn't leave it as mere accidental injury. Science is looking at ways to tame and weaponize this effect. What they've come up with is called a "sound bullet."
Sound bullets are still mostly the realm of science fiction, but scientists have developed a small-scale device inspired by Newton's cradle - that row of hanging ball bearings on your professor's desk that no living being can resist flicking. The developers of the sound gun scaled up their incessant clacking by lining 21 of these things up together and focusing the resulting racket through an acoustic "lens."
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"EMPTY THE REGISTER OR I'LL FUCKING WASTE YOU!"
It's thought that the technology could be intensified to a point where it could punch holes in bunkers or sink submarines. Or, on a more benevolent note, they could be used to kill tumors -- although technically that's a side effect of killing a whole person anyway.