Related:

• Murder is always a mistake.... One should never do anything that one cannot talk about after dinner.
  -- Oscar Wilde...
• Murder is always a mistake -- one should never do anything one cannot talk about after dinner.
  -- Oscar Wilde, "The Picture of Dorian Gray...
• One trivial mistake in syntax can cause hundreds of embarrassing error messages.
• People always remember the last mistake you made.
• The mistake you make is in trying to figure it out. -- Tenessee William
• I'm tenured, there's almost nothing you can do about it.
  (after making a mistake in sign convention)...
• Do not mistake a child for his symptom. Erik Erikso
• Always watch where you are going. Otherwise, you may step on a piece of the Forest that was left out by mistake.
  -- Pooh's Little Instruction Book, inspired by A. A. Milne...