I want to hear about things that aren't physically possible to do. And not things like "jump off a cliff and live, while running off of it with 3 busses tied to your back."
Things like:
Less than 5% of the population can touch their thumb to their wrist. (The bottom of your wrist, where emo kids cut themselves.) Its more like your forearm when you do it though.
Less than about 2% of the population can lick their elbows.
And
It's impossible to tickle yourself (there IS a way, but thats not to be discussed here...) because to be tickled requires you to be surprised and if you are going to do it to yourself then your brain anticipates it.