Muphry's law is an adage that states: "If you write anything criticizing editing or proofreading, there will be a fault of some kind in what you have written."[1] The name is a deliberate misspelling of "Murphy's law".
Names for variations on the principle have also been coined, usually in the context of online communication, including:
Umhoefer's or Umhöfer's rule: "Articles on writing are themselves badly written." Named after editor Joseph A. Umhoefer.[2]: 357
Skitt's law: "Any post correcting an error in another post will contain at least one error itself." Named after Skitt, a contributor to alt.usage.english on Usenet.[3]
Hartman's law of prescriptivist retaliation: "Any article or statement about correct grammar, punctuation, or spelling is bound to contain at least one eror [sic]." Named after editor and writer Jed Hartman.[3]
The iron law of nitpicking: "You are never more likely to make a grammatical error than when correcting someone else's grammar." Coined by blogger Zeno.[4][5]
McKean's law: "Any correction of the speech or writing of others will contain at least one grammatical, spelling, or typographical error."[6] Named after editor Erin McKean.
Bell's first law of Usenet: "Flames of spelling and/or grammar will have spelling and/or grammatical errors." Named after Andrew Bell, a contributor to alt.sex on Usenet.[7]
Further variations state that flaws in a printed ("Clark's document law") or published work ("Barker's proof") will only be discovered after it is printed and not during proofreading,[2]: 22, 61 [8] and flaws such as spelling errors in a sent email will be discovered by the sender only during rereading from the "Sent" box.
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^Quinion, Michael (10 November 2001). "Verbatim". World Wide Words Newsletter (596). Retrieved 2009-10-19. Erin McKean described what she calls McKean's Law: "Any correction of the speech or writing of others will contain at least one grammatical, spelling, or typographical error."