I can do many of the weird contortionist things mentioned already. AIW and I may have been separated at birth. Most of my joints hyperextend, sublex or pop. I’ve grossed medical staff out more than once with more than one oddly bendy body part. I have a word of caution for the rest of you who are bendy like that:
Just because you CAN move your body like that doesn’t mean you SHOULD.
I’m only 32, but the joint damage I’ve got at this point makes me act more like I’m 62 sometimes. I’ve spent more time at the physical therapist’s than most people in their thirties would even dream of. Naproxen Sodium (prescription strength Aleve) is my friend. So be careful when contorting & make sure the muscle groups surrounding & controlling the joint are up to snuff.
With that caution out there, here’s my 2nd weirdest trick, and 2trew, you’ll be pleased to hear this:
I can bend only the top knuckles of all eight of my fingers. When I do, I look like a horror flick freak.
I’m sure the ability to do this is related to my weirdest trick, which is the ability to dislocate & (what would you call it?) relocate/undislocate all of the middle joints of my fingers. If I could hold my hands up to your ears, you could hear the noise this makes. This noise, I am told, has almost made several people throw up. Aaaaahhhh, for lack of sound-o-net.