Ha!. Many, many years ago I got my first motorized two wheeler. A nifty thrifty Honda 50. I saved my paper route money to buy the bike. As soon as I got it I doubled the size of my paper route, since I was so much more efficient with the little Honda. Riding home after delivering all my Sunday papers one morning the canvas bags that held the papers, now empty, caught in the rear wheel. The result was the same as yours. Smacked my bare head on the pavement. A little blood but luckily no real damage. Later that day my mother bought me my first helmet.