A Pan Am 727 flight waiting for start clearance in Munich overheard the following:
Lufthansa (in German): Ground, what is our start clearance time? Ground (in English): If you want an answer, you must speak in English.
Lufthansa (in English): I am a German, flying a German aeroplane, in Germany. Why must I speak English?
Unknown voice from another plane (with British Accent): Because we won the bloody war.