Save for an e-mail at the end of the video, it's not clear who made this teensy cannon or how. But it's become something of a YouTube hit. And for good reason, since it makes for riveting viewing as you watch a harmless paperweight turn into what has to be the smallest homemade fully working cannon, with the help of a snort of gunpowder in the barrel, a ball bearing, stick of fuse, and a lighted cigarette.
There's enough firepower here to shatter an egg, a glass mug, and numerous objects to devastating effect. See what having too much free time on one's hands will cook up?