A quarter of a century ago or so there was a well known eccentric who used to accost passers by on Princes’s St and ask them ‘are you sane?’ If any replied ‘YES’ he would retort — ‘AAH but can you prove it?’ And as the could not, he procedded triumphantly to show them that he could prove his sanity by producing his own certificate of discharge from a mental hospital…
Ernest Gellner 1979
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