This article for the New Yorker profiles a kind of young, hip scientist who is studying why time seems to slow down during moments when you might die. The article starts off with a recounting a time when the scientist, David Eagleman, a professor of neuroscience at Baylor, fell off the roof of a house as a kid. He mentions the moment when you realize you are really falling. That's a scary moment. In my experience, when you jump off anything over 20 feet high there is a moment I refer to as the "oh fffffuck" moment. The time when your body is telling you you should have landed by now, but for some reason you haven't. You don't even want to scream, you just state to yourself as a matter of fact "oh fffffuck." No matter how many times you do it, it happens. It's really a disconcerting spot to be.