The waitress serving my coffee is wearing cat's eye glasses. She smiles and pours and her bright red lips part to reveal a smudge of lipstick on her front teeth. As if she'd bitten her lip and a single drop of blood stained her teeth. No.... as if she's a lioness who's just brought down a gazelle. Should you tell a stranger she has something on her teeth; that you can see the gazelle blood when she smiles?