1. At a restaurant.
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2. At the airport.
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3. At work.
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4. At the movies.
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5. In a receiving line of any kind.
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6. When someone pays you an unreturnable compliment.
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7. After a sporting event in which you participated and not the other person.
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8. As a matter of repetition.
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9. When it's your birthday and not somebody else's.
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Thumbnail image by Suzanne Plunkett for Reuters
