Scientists at NASA built a device to launch dead chickens at the windshields of airliners, military jets, the space shuttle, etc. The idea being to simulate collisions with airborne fowl to test the strength of the windshields.
British engineers heard about the device and were eager to test it on the windshields of their new high speed trains. Arrangements were made and a device was sent to the British engineers.
When device was fired, the British engineers were shocked... 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.
The horrified Brits sent NASA the disastrous results of the experiment, along with the designs of the windshield and begged the US scientists for suggestions.
NASA responded with a one-line memo: "Defrost the chicken."