I can make clicking/popping sounds with my toes.
I can wiggle my ears and do the vulcan peace sign.
I can crack many joints in my body.
I can sit in "inverse lotus" position, where my legs would fold out away from my body, rather than towards it. Try it, its harder than it sounds
I am also very easily amused. It takes surprizingly little to get me cracking up and completely incapacitated with hysterical giggling.