Godwin’s law (also Godwin’s rule of Nazi analogies) is an adage in Internet culture that was originated by Mike Godwin in 1990. The law states that:
As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches 1.
Although the law does not specifically mention it, there is a tradition in many Usenet newsgroups that once such a comparison is made, the thread is over, and whoever mentioned the Nazis has automatically lost whatever argument was in progress. Godwin’s law thus practically guarantees the existence of an upper bound on thread length in those groups.
“Mail Guy’s plaque“, posted to Flickr by kentbrew:
I think this might be the first time a corporate war has semi-invoked Godwin. Let us never forget.