The Adam Bomb has two halves that clip together to form a bomb that if you put powder inside it simulates an explosion on impact. The Adam Bomb has four clips on the inside that easily release on impact. Most of the energy gets dissipated and then the bomb can then be reused.
You can experiment with different inert ingredients. In this picture a wide variety of spices that had gone stale are shown to demonstrate that your imagination can go wild with regards to making a good simulated explosion.