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Originally Posted by Rhunex  Also, with a few pbc pipes a pbc joint thing(i dunno its technical term) and 3 shots of hairspray you can make a golfball cannon. Put the golfball in, which is stopped at the join, and on the other side have an area to hold flammable material(small chamber of sorts) put in three shots of hairspray/other flammable gas and light with a match. Don't put hand behind w/e hole leads to the flammable gas, light it indirectly if possible, or just hold the match near until it ignites, its very forceful and very dangerous. My friends were able to put a decent dent in solid wood with it. Beware, more than 3 shots of hairspray causes dangerous hair burning backfire, so do 3 at the most. Also, don't point towards civilization in general, the golf ball goes a long way with a lot of force.
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lol, potato guns.
which reminds me of this great 7-min tutorial on it which is basically the same thing you said, only with video results.
http://video.google.ca/videoplay?doc...&q=potato+guns
i did it back in highschool, found instructions online. works particularily well actually.