Quote:
Originally Posted by NatCh
Nah, nothing so simple as that. I like to take a test-tube (the kind with a stopper) and put some liquid canned air in it (hold the can upside-down and the liquid stuff comes out instead of the gaseous), then stopper the thing and wait for it to burst the stopper out. Makes quite a noise, and you get pretty impressive range if you do it reasonably well.
You just gotta watch out that you don't get the liquid on yourself -- frost-bite, you know. 
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Be a lot easier to buy pre-made canned air ones. They sell them at any electronics store almost. Definitely find them at a electronics parts store.