We are all familiar with the classic example of a weak thing breaking a strong thing - the ping-pong ball being shot through a ping-pong paddle at very high speeds. Source video here. This is useful (to a degree) for illustrating things like how aluminum planes can break though the steel and glass facade of a building. But I was wondering if the same thing might be possible with my favorite stand-in object: the aluminum soda can. I've done a couple of very preliminary experiments using bungee cords and a "sled" with a can on it. Two bungie cords to launch it. One to slow it down (allowing the can to continue ), and a "trigger" of a cable tie. Result is a high speed soda can that hits a target at failrt high speed. Calculating from the video, it goes at about 2/5 its length in 1/240th of a second, so 2/5*.12/(1/240) = 11.5 m/s or 25 mph. This, of course, is not very fast. The "slow" version of the compressed air ping-pong ball gun goes at 400 mph. I'm not sure if I'll proceed much more with this, as it would get dangerous fairly quickly. But I though I'd ask for suggestions. Is a vacuum tube the only way to go?