^Two carpenters are hammering nails into the side of a house,
  and one asks the other why he is examing each nail as he takes
  it out of the box and throwing half of them away. "They're
  defective," replies the second carpenter, holding one up. "The
  pointy end is facing the wrong way."

  "You fool!" shouts the first carpenter. "Those are for the other
  side of the house!"^

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