I wish I'd had a helmet when I was about 9 or 10 years old and wrecked my bike while riding down a hill during a bike-a-thon event. All I remember is going down the hill, all of a sudden my handlebars started shaking and my bike went out from under me. Hit the pavement with my face and had to have stitches on my upper lip and on my chin. Also scraped up my knees. Still have the scars to this day. But if I'd had a helmet with a visor it may have protected my face somewhat. Luckily no concussion or head trauma. When I got my bike the rear tire was flat, so I'm pretty sure that was the cause of the crash since I don't see how it would have gone flat from a crash.