Here's a law that strikes home here at Neatorama. There have been times when I've proofread, edited, and corrected the same thing ten times, but somehow a typo appears in the published version. I blame extraterrestrials. John Bangsund of the Victorian Society of Editors coined the term Muphry’s Law in 2003. It states:

1.   if you write anything criticising editing or proofreading, there will be a fault in what you have written;
2.  if an author thanks you in a book for your editing or proofreading, there will be mistakes in the book;
3.  the stronger the sentiment in (a) and (b), the greater the fault; and
4.  any book devoted to editing or style will be internally inconsistent

The law also goes on to state how readers will see these errors instantly. Link -via Boing Boing

(Image credit: Flickr user Squid Ink)