Spring-piston guns.

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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Fnord
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God damn, I must be Rag's polar opposite or something. I can hook a multimeter lead to one end of a 9 volt, hold the other lead, and get a reading of ~7 volts just by touching the battery with the other hand.

Show us the low-voltage LED trick that joanna mentioned and I'll be convinced, btw :)
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Ragnarok
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Sorry, you have me stumped there? Low voltage LED?
Does that thing kinda look like a big cat to you?
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Fnord
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Joanna said something about being able to get a small LED to glow dimly from body voltage alone. I was wondering if it was possible.
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Ragnarok
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Right... now it means something.
Yes, a few brands of LED's can be lit as such. I don't have any at uni, but I have a few back home.
Video in a coupla weeks if you want.
Does that thing kinda look like a big cat to you?
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