Wooden cannons from the Japanese Boshin War era. A silly yet fun invention that could fire a maximum of three times. For a long time I couldn't believe it myself, but if you think about it, who are we to judge? After all, it will soon be almost a century and we are still flying into space on chemical rockets invented by the crazy Nazi scientists to bomb London. Over 99% of them are single use fireworks that self-destruct every time. In a few hundred years people will be wondering what kind of retard invented it and how come instead of laughing at him everyone started using it.