Muphry’s Law is the editorial application of the better-known Murphy’s Law. Muphry’s Law dictates that:
a) if you write anything criticising editing or proofreading, there will be a fault in what you have written;
b) if an author thanks you in a book for your editing or proofreading, there will be mistakes in the book;
c) the stronger the sentiment in (a) and (b), the greater the fault; and
d) any book devoted to editing or style will be internally inconsistent.