Related:

• Important letters which contain no errors will develop errors in the mail.
  Corresponding errors will show up in the duplicate while the Boss is reading it....
• First Law of Office Murphology: Important letters that contain no errors will develop errors in the mail.
  Corollary: Corresponding errors will show up in the duplicate while the Boss is reading it....
• Important letters which contain no errors will develop errors in the mail.
  Corresponding errors will show up in the duplicate while the Boss is reading it....
• A column about errors will contain errors. -- Bill Gold
• All real programs contain errors until proved otherwise, which is impossible. -- Tom Gibb
• In any series of calculations, errors tend to occur at the opposite end to the end at which you begin checking for errors.
  -- Grelb's Law of Erroring...
• Mayne's Law: Nobody notices the big errors.