Matthew says: "Evan Booth builds weapons with materials purchased in an airport terminal, past the security screening. Here's a frag grenade built with a coffee mug, batteries, and a condom."
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