discovermagazine.com:

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. [ more ]