There's A Bomb In My Chocolate

Boing Boing pointed me to a BBC story about some ingenious booby traps and sabotage devices the Germans created during World War II, and the drawings of these devices by a British artist.  The artist, Laurence Fish, was the son of Police Inspector Donald Fish.  The senior Fish had been assigned to MI5's counter-sabotage unit, which consisted of only two other members, Victor Rothschild and his secretary.  Rothschild came across the devices in his work, and he commissioned the junior Fish, a self-taught artist, to draw them so British military personnel would be better able to defuse them.