Related:

• 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 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....
• If you hit two keys on the keyboard, the one you don't want will get to the screen first.
• Bring a gun! -- First rule of gunfighting