The office is the perfect place to find materials for making dangerous improvised weapons. (Please consult with HR before making dangerous improvised weapons.) There are heavy things and sharp things and also adhesives and rubber bands. Scissors, letter openers, and pens are menacing even in their original condition. Together these are also the building blocks for many tools that made the medieval era such an uncomfortable time to live. — As told to Caroline Winter
 
Watch Jörg Sprave explain how to weaponize office supplies at www.businessweek.com/howto/weaponize or in our iPad and iPhone apps

Photographs by Nick Ferrari for Bloomberg Businessweek