I hope this hasn't been posted, as it's "MY" story. And a true one at that! This guy flew out of the same FBO that I did at the time.
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Years ago when the transition from Statute Miles per Hour to Nautical Miles per Hour was taking place in the aviation industry there were obviously airplanes with the "older" MPH Airspeed gauges still installed.

One such airplane was Twin Bonanza N5636D.

Seems like 36 Delta was enroute somewhere and the Center asked him for his airspeed.

36 Delta replied, "150 Miles Per Hour, Sir."

The Controller came back with, "What is that in Knots?"

36 Delta replied: "I dunno, this is a Beechcraft, not a Chris Craft, you figure it out!"