fool

fool n.  As used by hackers, specifically describes a person
   who habitually reasons from obviously or demonstrably incorrect
   premises and cannot be persuaded by evidence to do otherwise; it is
   not generally used in its other senses, i.e., to describe a person
   with a native incapacity to reason correctly, or a clown.  Indeed,
   in hackish experience many fools are capable of reasoning all too
   effectively in executing their errors.  See also {cretin},
   {loser}, {fool file, the}.

   The Algol 68-R compiler used to initialise its storage to the
   character string "F00LF00LF00LF00L..."  because as a pointer or as
   a floating point number it caused a crash, and as an integer or a
   character string it was very recognisable in a dump.  Sadly, one
   day a very senior professor at Nottingham University wrote a
   program that called him a fool.  He proceeded to demonstrate the
   correctness of this assertion by lobbying the university (not quite
   successfully) to forbid the use of Algol on its computers.  See
   also {DEADBEEF}.