Game link: https://www.crazygames.com/game/demolition-derby-2
This (not a bug) works if you crash a car so hard it launched into the sky and landed on your car and then BOOM, your car got SMASHED! Here are the controls (about the tank.. I don't know) Accelerate - ↑ brake - ↓ steer left/right - ← / → nitro - shift (only can if you bought it) change camera - C