Little dance for mousetraps and pingpong balls

Take plenty of mousetraps, plenty of pingpong balls and a camera that can shoot 240 frames per second in movie mode. My friend H. wanted to demonstrate the mechanism of chain reactions to his class, so he had plenty of mousetraps and pingpong balls around. I happend to drop by with the camera by chance, so we improvised a little experimental setup. Interestingly several modern cams (at least from Casio and Fuji) now have impressive slow-motion modes.