Cranwell groundschool, S/L Enderby's Nav lesson mid '70s, remember BEags?
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After a whole lesson of definitions (eg definition of West= direction in which the Earth rotates; East= opposite of West; Kilometre = One 10,000th of the average distance between the Equator and either Pole; etc, etc) the time came for Enderby to check us on our information retention.
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"OK lads, what is the definition of a Statute Mile......wait for it, wait for it...... Flying Officer Sp**g"
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Sp**g looks up from his notes and promptly replies:
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"It's one 256th of the average distance between here and Barrow-in-Furness SIR; it says so here on my 1771".