A few months ago I was on a 4 lane divided highway up near the Twin Cities, when a pretty large rock (It looked like it was about big enough that if you wrapped your arms around it that you could just touch your fingers) fell out of a dump truck, bounced over the 3 or 4 ft high cement dividing median. The truck was in the far left lane and I was in the far right lane. The rock managed to bounce across the two lanes and before I had time to think it was right in front of me. With almost no time to react, I didnt have time to check my mirrors to avoid it one way or the other and just hit the brakes. Fortunately, and God only knows how, it bounced under the car, and only left a small dent in the gas tank. A split second later and it would have went through the radiator or windshield. Scary stuff. Wish I would have seen the name on the truck.