IIRC, i'm not using a call to a CollisionEvent-initiating method in the car-demo on the car itself. This means: To trigger the event, you would have to call some checkXXXCollision-Method on the car. Otherwise, the collision won't be noticed. You have to do something similar to the bullets, just with the car. If you are interested in triggering the event only, you can even ignore the result of that method call.