spoiler

spoiler n.  [Usenet] 1. A remark which reveals
   important plot elements from books or movies, thus denying the
   reader (of the article) the proper suspense when reading the book
   or watching the movie.  2. Any remark which telegraphs the solution
   of a problem or puzzle, thus denying the reader the pleasure of
   working out the correct answer (see also {interesting}).  Either
   sense readily forms compounds like `total spoiler',
   `quasi-spoiler' and even `pseudo-spoiler'.

   By convention, articles which are spoilers in either sense should
   contain the word `spoiler' in the Subject: line, or guarantee via
   various tricks that the answer appears only after several
   screens-full of warning, or conceal the sensitive information via
   {rot13}, or some combination of these techniques.