In response to the SR-71 tales, I read a conversation that went something like this. Not sure if it is true though.
SR71 to ATC "Good Morning, callsign is requesting FL600"
ATC - "callsign, if you can get high enough, you are cleared to FL600"
SR71 - "Thank you, callsign descending to FL600"
Also, a great rumour doing the rounds was that the USAF put a concrete bomb through the front door of the French Embassy inTripoli, for making them go the long way round!!