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potato gun is a length of pvc pipe (about 3-4'), with the outside tapered on one end, and a chamber on the back end, with a cap and a gas-grill lighter. You jam a potato into the open end and ram it down (the taper around the end cuts off any excess potato so it makes an airtight seal). Then you remove the cap, fill the chamber with some really cheap hairspray (like aquanet), screw the cap on real quick, point it away from anything that may cause a lawsuit, then push in the lighter button.
It makes a loud "WHAP!" sound, and send the tater flying hundreds of feet.
here is what one looks like:
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