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What's the law for someone always mentioning Betteridge's law of headlines when a headline is posed as a question on Hacker News?

How about this one:

Any time a commenter cries ad hominem, there will be a sub-thread arguing about the definition of ad hominem.

I came to this comments page just to check if quarterto's law was still holding up :)

"I wanna sound smart without too much effort" law of comments.