4. Skitt’s Law: Expressed as "any post correcting an error in another post will contain at least one error itself" or "the likelihood of an error in a post is directly proportional to the embarrassment it will cause the poster."
It is an online version of the proofreading truism Muphry’s Law, also known as Hartman's Law of Prescriptivist Retaliation: "any article or statement about correct grammar, punctuation, or spelling is bound to contain at least one eror".
That's nice to know. Link -via Digg