:Green's Theorem: [TMRC] prov. For any story, in any group of
people there will be at least one person who has not heard the
story. A refinement of the theorem states that there will be
*exactly* one person (if there were more than one, it wouldn't be
as bad to re-tell the story). [The name of this theorem is a play
on a fundamental theorem in calculus. --- ESR]
-- The AI Hackers Dictionary