Hi Todd, Collision detection is really only for use in the assembly room when creating scenes. It allows you to "bump" or put objects in contact with one another without having them intersect. To get the results your asking for will require either the use of phyics or the explosion modifier with the "floor" parameter set to your actual floor. To get bouncing you have in mind, the Explosion modifier won't perform. In that case you'll need to use objects with physics or use a particle generator with "collides with objects in scene" enabled to create that effect. Explosions are actually pretty complex things to create in CG. Mark