I've studied it more than I want to admit. Any time someone has a camera pointed right at someone when they fall I'm a little skeptical. That awkward ankle twist is what makes it look legit. And makes it funny to those of use who never quite matured the way we should have. The popcorn throw is the money shot though.
Her name is Paige Ginn, and she's basically a pro at this. You'll find several videos of her doing some pretty insane falls. Not sure how she does it without getting injured, but she definitely does it on purpose, and definitely does an amazing job dramatizing it.