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"Bouncing Betty" and "Leaping Lena" are names for the Nazi S-mine. No bigger than a quart-size tin can, it is buried close to the surface. When it is tripped it leaps five feet into the air, then explodes in a spray of steel in all directions.
One classic example of German ingenuity now taught the troops is the mine which is itself mined. To Tellers the Nazis attached delayed-action booby traps set to explode ten minutes after the Teller was dug up.
What next? U.S. soldiers must still learn the hard way.