We had great fun with this in my neighborhood when I was, oh, fourteen years old

or so.

  1. Take a tennis ball can (we had metal ones in those days, but I suppose the new plastic ones would work too, at least a few times).
  2. Cut a small hole near the bottom of the can.
  3. Now pour some rubbing alcohol in the can. Not too much!
  4. Drop a tennis ball in, take aim, then fire it by sticking a lighted match in the hole. The tennis ball will easily fly thirty or forty feet in the air.

Sometimes it would catch on fire and we would have to chase a flaming tennis ball

across the neighbor's lawn. Be careful. It was safe enough with rubbing

alcohol, which is diluted isopropyl alcohol. Using anything stronger than

rubbing alcohol is asking to have your hand blown off.

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