When receiving a plant gift that doesn't fit your garden plan, it's more polite to accept it and later compost it than to decline the gift.
For a janitor entering a women's restroom, placing a sign indicating it's being cleaned is a courteous way to inform anyone inside, allowing for privacy.
When you want to avoid hugging during the wedding receiving line, two-handed handshakes are acceptable, but expect some embrace mishaps regardless.
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