Related:

• You have there hit the nail on the head. -- Francis Rabelais (1495-1553) -- Works, Book iii, Chap.
  xxxiv...
• You hit the nail right between the eyes.
• Hit the nail on the head. -- John Fletcher (1576-1625) -- Love's Cure, Act ii, Sc. 1
• If you hit a man over the head with a fish, he'll have a headache for a day.
  But if you teach a man to hit himself over the head with a fish, he'll have headaches for the rest of his life....
• When hammering a nail, you will never hit your finger if you hold the hammer with both hands.
  -- Leibowitz's Rule...
• Leibowitz's Rule: When hammering a nail, you will never hit your finger if you hold the hammer with both hands.