] One of the most famous pieces of Usenet trivia out there
] is "if you mention Hitler or Nazis in a post, you've
] automatically ended whatever discussion you were taking
] part in". Known as Godwin's Law, this rule of Usenet has
] a long and sordid history on the network - and is
] absolutely wrong. This FAQ is an attempt to set straight
] as much of the history and meaning of Godwin's Law as
] possible, and hopefully encourage users to invoke it a
] bit more sparingly. Of course, knowing Usenet, it won't
] do an ounce of good...

How to post about Nazis and get away with it - the Godwin's Law FAQ