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