Related:

• Leibowitz's Rule: When hammering a nail, you will never hit your finger if you hold the hammer with both hands.
• When hammering a nail, you will never hit your finger if you hold the hammer with both hands.
  -- Leibowitz's Rule...
• Never use your thumb for a rule. You'll either hit it with a hammer or get a splinter in it.
  -- Uncle Ed's Rule of Thumb...
• Uncle Ed's Rule of Thumb: Never use your thumb for a rule.
  You'll either hit it with a hammer or get a splinter in it....