In reply to Cypher:
I rely on a number of other things besides the sound principles of retreat from Moscow or Dunkirk. Firstly, there's the SOE principle (or MI5, MI6 or SAS if you prefer) that relies on no-one ever knowing you were interested in the first place.
Secondly, there's always my invisible friend, Reg, my Random Excuse Generator, who can usually be relied upon to pull something credible out of the bag to avoid Humiliation.