Reinventing the Pocket Knife As a Crazy MacheteEric Limer11/03/12 11:18am5EditPromoteGo to permalink Do you carry a pocket knife? Does anyone anymore? They can be helpful if you need to open a stubborn package or if you need something for the TSA to take from you at the airport. But though they're sometimes useful, they aren't particular fearsome. At least, until Joerg Sprave makes one.