May I See Your Pilot's Licence?

We've probably all heard the humorous story of the traffic cop that pulled over a speeder, walked up to the speeder's open window and satirically said, "okay pal, let's see your pilot's licence." To the officer's astonishment, the errant driver sorted through his wallet and produced a valid pilot's licence. After being one-upped by the speeder, the officer wisely warned him to keep his speed down while on the ground.