I used to date a girl who could do that with one of her legs.. she got it bent completely backwards in a soccer game and now it'll just kind of do that even though she can walk just fine.
Impressive. I've worked about 5 Cirque du Soleil tours and many more knock-offs (like Cirque Dreams) so I'm kinda used to being back stage, but nothing's weirder than seeing the really good contortionists doing their moves without their costumes, just like a regular guy/gal on the street.
That being said, I get animal transformation videos that are borderline porn and walkthroughs for the indie prison game Hard Time recommended for me, no matter what I'm looking up. And this website is to blame.
This should have been sent along on Voyager so the aliens that come here pretending to be humans will be all fucked up and we will immediately kill them with fire.