Catch-22

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A self-contradictory rule; a kind of paradox.  

The original Catch-22, in Joseph Heller’s book of the same name, summed up the insanity of war. Anyone attempting to get discharged for insanity, according to the fictional rule, would be declared sane because only the insane want to be in the war.

The best way to get fat is to starve. Word Hero