Scientists at Rolls Royce (Derby, England) built a gun specifically to launch
dead chickens at the windshields of airliners, and military jets,
all travelling at maximum velocity. The idea is to simulate the
frequent incidents of collisions with airborne fowl to test the
strength of the windshields.

American engineers heard about the gun and were eager to test it on
the windshields of their new high speed trains. Arrangements were
made, and a gun was sent to the American engineers. When the gun was
fired, the engineers stood shocked as the chicken hurled out of the
barrel, crashed into the shatterproof shield, smashed it to
smithereens, blasted through the control console, snapped the
engineer's back-rest in two and embedded itself in the back wall of
the cabin, like an arrow shot from a bow.

The horrified Yanks sent Rolls Royce the disastrous results of the
experiment, along with the designs of the windshield and begged the
British scientists for suggestions.

Rolls Royce responded with a one-line memo:

"Defrost the chicken."