My son has a Lego police car that came with literal Lego caltrops. They are intentionally designed to sit with a spike pointing upwards no matter how they fall.

My son has a Lego police car that came with literal Lego caltrops. They are intentionally designed to sit with a spike pointing upwards no matter how they fall. I can only assume it is the product of many hours of maniacal laughter over in Denmark somewhere.