A triple back-flip on a bmx bike.
Buzzing a group of people after BASE jumping off a mountain with a wing-suit (the amazing part starts around 1:15).
Complex barbell movements.
What do these three have in common? They're not the first step you should take when learning how to do them. First, you should learn the mechanics. Next, you need to be able to perform them consistently. Then, and only then, should you add intensity.
Just ask that chick who landed that snatch like a wet noodle.