"What you do with strangers is ignore them for. No second chance, no sorry I did it, never accept an apology, but never, ever get angry with strangers."

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The etiquette business has its emergencies, heaven knows, but it is in the nature of etiquette emergencies that once one realizes what one has done, it is too late. One might as well get a good night's sleep and send flowers with an apology in the morning.

— Judith Martin