Actually you don't fall, the world tilts. I went down for the first time as an adult yesterday morning in the rain trying to traverse over a huge branch that had landed (or placed) on a paved bike path. Hitting the pavement this time felt a lot softer than I remember as a kid. Of course this event was witnessed by a line of truckers waiting at a grain elevator. They were all blaring their air horns as I got up, brushed off and moved the stick.