Which law says that, as an online discussion lengthens, the probability of mentioning Nazis gets close to 1?

Tom, This is how dumb people argue.

fergiethefrog, it is not related to Naziism as such. The conversation could be about anything. It might be about, say, coffee. As the discussion becomes heated someone will start name calling, ignoring the topic. The common final retort is "you Nazi". But just because the person disagrees with the other person.