This happened in China. A guy's dashboard cam filmed a runaway truck passing him in the next lane of a mountain road. So he picks up speed and drives PAST the truck and then waits for it to come by again.
When it does, he jumps inside and hits the brakes to stop it. The original driver of the truck had pulled over to the side of the road to check something underneath . . . but the truck ROLLED OVER him and started coasting downhill. The description on YouTube says he suffered fractures.