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Neil Patrick Harris + sulfur hexafluoride = the booming voice Dr. Horrible wishes he had

Sulfur hexafluoride is a gas that's several times heavier than air. When you inhale it, it leads to the exact opposite of helium voice: a deep, rumbling vocalization that sounds suspiciously like a record on slow speed.


You can read the explanation behind sulfur hexafluoride's effect on your voice here. But for now, here's Neil Patrick Harris with a couple lungs full of the heavy stuff. (Kelly Ripa was there, too. But we all know you're here for NPH and his Buffalo Bill impressions.)


H/T Rebecca Guenard

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Burglar von Ham

You might want to point out that you should not try this without supervision ( granted most people dont have access to sulfur hexafluoride (SF6), you dont really find that at the supermarket or hardware store). Because it is more dense than air it also gets trapped in the bottom of your lungs and lowers you breathing capacity. Too much SF6 and you can die by suffocation. Usually you have to stand you head for a while to get it out of your system. I had a college professor that would do the same thing with Argon.