Bubblegum, you're a freak!! No, just kidding. I can dislocate both of my shoulders and one of my hips. I pop almost every joint (did it on purpose when I was younger and am now regretting it, sounds like a small arms war when I get up in the morning). But I think the weirdest thing that I can do is make a fist with my left hand, then point my first and pinky fingers straight out, then touch them tip to tip across my other fingers.
Like I was gonna do the rock-n-roll hand

Then just make my fingers meet in the middle. I can't find a pic anywhere.
I can also do this