Hinklestein: a concrete barrier used to keep tanks on the road when traveling between training area in Germany. They're like 90% below the ground (think iceberg), so the 2' or so above ground is *extremely* strong. They line some of the stages in the Germany Rally. When a WRC car hits one, it can cause the cage to fail, so the resulting roll over does this to the car:
The in-car footage is downright scary.