Probably a plastic dust shield the cars have up front. It's a PITA. Needs to be removed to gain any type of access to the underside. I can see if someone were to bottom out a few times the front plastic clips braking off which would allow air to get in there and at high speeds pushing it down enough that if a pothole or something that would cause the car to dip and have it hit the ground it would break off. Sounds like you had fun though!