Meme, Counter-meme
http://www.wired.com/wired/archive/2.10/godwin.if.html
By Mike Godwin
It was back in 1990 that I set out on a project in memetic engineering. The Nazi-comparison meme, I’d decided, had gotten out of hand - in countless Usenet newsgroups, in many conferences on the Well, and on every BBS that I frequented, the labeling of posters or their ideas as “similar to the Nazis” or “Hitler-like” was a recurrent and often predictable event. It was the kind of thing that made you wonder how debates had ever occurred without having that handy rhetorical hammer.. . .
I developed Godwin’s Law of Nazi Analogies: As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches one.
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I seeded Godwin’s Law in any newsgroup or topic where I saw a gratuitous Nazi reference.