I can dislocate one of my toes at will.
It's not a good thing.
I can pull my left humerus from the shoulder joint and both of my femurs from the hip (but not at the same time, since I can only do it while standing). My right arm is boring cause I can't seem to do it on that side.
I can also crack all ten of my toes, all ten fingers, my wrists (left is easier than right), elbows, knees, ankles (unlimited amount of times), and back. I wish I knew how to do my neck so I can ease the restlessness in it.