My friends back home all do this, and I have been wont to "bomb a hill" when the opportunity arose. I never understood how to stay in control at tremendous speeds, however. I was "skitching" (holding on to a moving car) down this sizable hill one day, got to that speed where the board just wobbles, and I fell into the pavement and dirt, bouncing all over the place. Pretty horrible, I had road rash on my back and all my joints, and cracked my elbow. Scary shit!