Related:

• Finagle's Third Law In any collection of data, the figure most obviously correct, beyond all need of checking, is the mistake.
  Corollary 1: No one whom you ask for help will see it....
• Any issue worth debating is worth avoiding altogether. -- Fahnstock's Third Law of Debate
• The most valuable quotation will be the one for which you cannot determine the source.
  -- Duggan's Law of Scholarly Research The source for an unattributed quotation will appear in the most hostile review of your work....
• Harper's Magazine's Law You never find an article until you replace it.
• If, when completion of a design is imminent, field dimensions are finally supplied as they actually are - instead of as they were meant to be - it is always simpler to start all over.
  -- Third Law of Revision It is usually impractical to worry beforehand about interferences - if you have none, someone will make one for you....
• 80% of the final will be on the one lecture you missed and about the one book you didn't read.
  -- 1st LAW OF TESTS...
• A slipping gear could let your M203 grenade launcher fire when you least expect it.
  That would make you quite unpopular in what's left of your unit....
• Chisolm's Third Law, Corollary 1: If you explain so clearly that no one can misunderstand, somebody will.
• No one you ask to help find a mistake will see it. -- Finagle's Third Law, Corollary 1