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