I built a wheeled drilling vehicle with a movable drilling section attached to a rotor and a piston. This vehicle was not well balanced and it overturned when I moved the rotor too far. I expected this but I did not expect the uncontrollable, wild and continuous spin that followed. I exited the vehicle and watched as it proceeded to destroy itself as it bounced around on a perfectly flat surface. This did not stop even after the drills were broken off. It was behaving as though there was a single thruster stuck on full power. But the vehicle only had wheels. All I could do was watch it bounce around thinking "where is all this energy coming from?". It looked like it was never going to stop.