This was around 1993.
Remember the story when former President Bill Clinton was visiting Southern Californa and was getting ready to Depart LAX aboard Air Force 1 and he was getting some personal grooming performed on the taxiway.
(For those of you who have never flown into an Airport where Airforce is operating, they ground stop all civilian traffic or send all airborne traffic into holding patterns indefinitely)
About 3 weeks Later I was flying into CLE Hopkins............Guess who was there visiting in Air Force 1?
Cleveland Center was vectoring everyone into holding patterns....................
CO XXX asked center "what the expected delay was"...............................
Center came back with "How long can you hold"
COXXX without a pause said " It depends on if the President is just getting a trim or the full service"............
......................You could have heard a PIN drop on center Freq for about 1 minute