Related:

• Uncle Ed's Rule of Thumb: Never use your thumb for a rule.
  You'll either hit it with a hammmer or get a splinter in it....
• 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....
• 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...
• As a general rule of thumb, never trust anybody who's been in therapy for more than 15 percent of their life span.
  The words "I am sorry" and "I am wrong" will have totally disappeared from their vocabulary....
• 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.