Helium is 6x less dense than air and makes your voice sound like you just got kicked in the pickle. But sulfur hexafluoride is 5x denser than air and makes you sound like a badass supervillian. You've got to hear it to believe it. And while Adam made me promise at the beginning of the video I wouldn't try it at home, I had my fingers crossed. I hope I die!
Hit the jump for two more MUST SEE physics videos, one a supersonic jet creating a halo of water vapor, and one of sound waves on fire.
Top Ten Amazing Physics Videos [wired]
Thanks to chaosthirteen, who once got rowdy with anarchyfourteen and destroyed an entire village.