Well, I finally got around to trying out the matchstick rocket thing I mentioned yesterday. It didn't work. The first one just flared up and blew out the tin foil on one side. The other two didn't even ignite. In fact, the other two were practically burned to a crisp while I tried to light them. Maybe none of them worked because I did it wrong, or maybe it was because I used really cheap matches that were difficult to light. I'll file this experiment under marginally interesting failures.