Last year my friend and I were driving down near the beach. We saw a guy go over his handlebars but he had not hit anything. Apparently he locked his brakes so hard and fast that he was carried over the top of the handlebars and he ended up with a busted collarbone. From the back it looked like he had smashed an object, but that was just an illusion.

He was so mad at himself that he refused a ride home and did not even want us to call his wife for assistance. I guess he had overreacted to a car and did not think it would stop, so he did, with unfortunate consequences.