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Fun with physics.  
04:26pm 29/07/2009
It's called a vortex cannon. It is made of equal parts physics and awesome.

... I am going to build one bigger than theirs, and point at my front door, concealed in the shrubbery about 30 feet away. It will be wired to the doorbell. There will be a sign next to the doorbell which will read, "Do not ring this doorbell more than twice." In any given 5 minute period, the first ring will prime it, the 2nd will arm it, and the third will summon the punch line.
location: Land of Caps
mood: Inspired
music: Escala - Palladio
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(no subject)
09:08pm 29/07/2009 (UTC)
There was a good moment earlier on in the program when he tested the prototype. It launched the votrex with an awful bang and he fell over in shock!

On a less explosive scale, you can get what's known as an Airzooka, which is a small hand-powered one.
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(no subject)
09:21pm 29/07/2009 (UTC)
Oh, aye. I've been chasing the cats around the house with one of those for a while now. :-) I just never thought seriously about scaling it up to misdemeanor levels and powering it like a potato gun.
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(no subject)
09:15pm 29/07/2009 (UTC)
Oh, have a look at http://www.youtube.com/watch?gl=GB&hl=en-GB&v=SRIbNv01sKs as well - that was a live running by the show of a rather Heath Robinsion setup known as the "Big Contraption".
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