The U.S. Military has been after a vomit-inducing weapon for years. The idea is to use flashing lights that can make an enemy so dizzy, he hurls (and thereby becomes disoriented and unable to fight). But while the government has sunk millions into creating the perfect spew-ray gun, a couple of hardware hackers recently slapped one together for around $250. From Wired.com:

Using a flashlight from Sears, a set of three-dollar LEDs, a nine-volt battery, and a heat sink ripped off a PC processor, they managed to put together a functioning dazzler-cum-vomit-beam. And then they published step-by-step instructions on how you can build one, too.

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Image: ladyada.net