Another great one:
One day, high above Arizona , we were monitoring the radio traffic of
all the mortal airplanes below us. First, a Cessna pilot asked the air
traffic controllers to check his ground speed. 'Ninety knots,' ATC
replied. A twin Bonanza soon made the same request. 'One-twenty on the
ground,' was the reply. To our surprise, a navy F-18 came over the radio
with a ground speed check. I knew exactly what he was doing. Of course,
he had a ground speed indicator in his cockpit, but he wanted to let
all the bug-smashers in the valley know what real speed was 'Dusty 52,
we show you at 620 on the ground,' ATC responded. The situation was too
ripe. I heard the click of Walter's mike button in the rear seat. In his
most innocent voice, Walter startled the controller by asking for a
ground speed check from 81,000 feet, clearly above controlled airspace.
In a cool, professional voice, the controller replied, ' Aspen 20, I
show you at 1,982 knots on the ground.' We did not hear another transmission on that frequency all the way to the coast.