I had something similar happen once. I was riding and turned to look over my shoulder to see if any cars were coming so I could swing around a parked pickup truck. When I went to look forward I was about 5 feet from the back of the pickup. I also did not put on my brakes and hit it going about 10 miles per hour. I didn't go into the back but I did get a cut on my shin. I went up to the homeowners house and had to tell them that I had dented their bumper. The guy was totally cool and told me not to worry about it and even gave me a bandage for my leg. The good thing was that I still got to finish my ride.