A friend of mine just fell prey to....well, actually, I didn't remember the name of the Law she stumbled into, but I remembered there was one (the only one I could recall was the frequently cited Godwin's Law, which wasn't the one I wanted), so I took a deep breath, centered my chakras, assumed the appropriate stance, and activated my google-fu:
Internet rules and laws: the top 10, from Godwin to Poe
For those too lazy to click through (just taking the first quote from each, original gives you more background):
1. Godwin’s Law "As a Usenet discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches 1."
2. Poe’s Law “Without a winking smiley or other blatant display of humour, it is impossible to create a parody of fundamentalism that someone won't mistake for the real thing.”
3. Rule 34 “If it exists, there is porn of it.”
4. Skitt’s Law "any post correcting an error in another post will contain at least one error itself"
5. Scopie’s Law “In any discussion involving science or medicine, citing Whale.to as a credible source loses the argument immediately, and gets you laughed out of the room.”
6. Danth’s Law (also known as Parker’s Law) “If you have to insist that you've won an internet argument, you've probably lost badly.”
7. Pommer’s Law “A person's mind can be changed by reading information on the internet. The nature of this change will be from having no opinion to having a wrong opinion.”
8. DeMyer's Laws (2nd) “Anyone who posts an argument on the internet which is largely quotations can be very safely ignored, and is deemed to have lost the argument before it has begun.”
9. Cohen’s Law “Whoever resorts to the argument that ‘whoever resorts to the argument that... …has automatically lost the debate’ has automatically lost the debate.”
10. The Law of Exclamation "The more exclamation points used in an email (or other posting), the more likely it is a complete lie. This is also true for excessive capital letters."