one time, my friend and I sat on the back of a hatchback & peed while another buddy drove. We wanted to see if we could pee all the way down the street. But when the driver shifted to 2nd, he dumped the clutch. The car lurched, I grabbed the rear wiper, and my friend rolled off the back at about 15 mph. Not wanting to damage his "package", he held on tight while he not-so-gracefully tumbled for what seemed like a painfully long time. When he got up his knuckles & face were all skinned up, but the exposed pee-pee was unscathed. He credited his quick thinking & the ability to resist the natural instinct to put his hands out to break his fall that saved his favorite body part.