I once was hit by a projectile that was deflected by, not thrown from a car. I was riding eastboud on the Trans Canada Highway, east of Calgary Albera. Out of nowhere, I was struck on the arm by something on the descent. It took a moment once I got stopped to realize, first that there was blood on my arm, and second, that the blood was not mine. I retraced my path to where the object in question lay, and found a freshly killed pigeon, obviously deflected off a moving vehicle.