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• A smile confuses an approaching frown.
• Smile, and the world smiles with you. Frown, and you frown alone.
• Standing on head makes smile of frown, but rest of face also upside down.
• Smile, and the world smiles with you. Frown, and you get credit for thinking.
• Standing on your head makes a smile of a frown, but the rest of your face is also upside down.
• To frown at pleasure, and to smile in pain.
  -- Edward Young (1684-1765) - Night Thoughts, Night viii, Line 1045...