Recently, I hit (not ran over) a very large (larger than a grapefruit), crumpled piece of rusty metal. I believe the metal (unidentifiable) glob fell off a truck transporting crushed cars??? I was riding across a busy bridge in the early evening hours and I didn't see the debris until the last minute plus it resembled a leaf. I was biking pretty fast and hit the debris so hard that my bike started wobbling and swerving. Instinctively, I kicked my feet out of my power grips to try regain some sort of balance. My husband was ahead of me and had no idea what was happening. I had visions of hitting a car, hitting the concrete, or going over the wall into the river. It was the scariest moment I've had so far on a bike. I have no idea how I regained control except I had a guardian angel that day. Of course, I had a flat tire though.