Lady Ada and Phil Torrone made a $250 working replica of the Dazzler, a $1 million non-lethal puke flashlight developed at the request of the US Dept. of Homeland Security. The link below includes complete instructions for making one of your own.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects