This happened sometime in sixties. My family has a cottage by a lake surrounded by about two hundred cottages. Neighbor's 15-16 years old son with two friends was driving neghbor's Renault 4 around the dirt road loop. In one place there was a shallow gully across the road where they tried to make the car jump. The friend sitting on the back seat flew forward, hit the rear view mirror with his forehead and landed back in the back seat. They made few more loops and returned to the cottage. His friend kept sitting on the seat. He was dead. He had small injury in the middle of his forehead that killed him. Needless to say the cars at that time had no seat belts and driving license age was 18.