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My friend made a potato cannon that used combustion to propel the potato. There was a tube and then two screws so the potato wouldn't go further, and then a bigger part where you could take off the end. You sprayed hair spray in there, shut it, pull the trigger which was an old BBQ ignitor, and BOOM! Potato is never seen again if you fire it into the air. If you didn't put a potato in there it would still make a lot of noise and pressure. Scared the crap out of his mom when he put in the hairspray and flames came out of the barrel and pushed a curtain a whole lot.
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