Related:

• Ancient custom has the force of law.
• There is a written and an unwritten law. The one by which we regulate our constitutions in our cities is the written law
  hat which arises from custom is the unwritten law....
• RITE, n. A religious or semi-religious ceremony fixed by law, precept or custom, with the essential oil of sincerity carefully squeezed out of it.
  -- Ambrose Bierce, "The Devil's Dictionary...
• Murphy's Eleventh Law It is impossible to make anything foolproof because fools are so ingenious.
• It is impossible to make anything foolproof, because fools are so ingenious.
  -- Murphy's Law Corollary 8...
• Graves dug to custom fits.
• The command of custom is great. -- Proverb
• Fools rush in where incumbents fear to tread. -- Augustine's Law Number XXXIII -- Norman R.
  Augustine, President and CEO, Martin Marietta...
• The gods do not protect fools. Fools are protected by more capable fools. -- "Ringworld