My first road bike, and I didn't know any better, had worn out tires when I bought it. One morning as I was doing laps around my neighborhood, I leaned into a right hand turn and POW!!! the sidewall on the front tire blows out. I began to right the bike, and of course couldn't make the turn and wound up flying over the handlebars and landing on my back in a neighbor's yard. No real harm, just a bit of adrenaline and I was pissed because I had to walk over a mile home.