I thought this list was very interesting:

1. Losing a parent
2. Going blind
3. Academic retainment
4. Welling in class
5. Parental fights
6. Caught in theft
7. Suspected of lying
8. Poor report card
9. Sent to principal
10. Having an operation
11. Getting lost
12. Ridiculed in class
13. Moving to a new school
14. Scary dream
15. Not making 100 on a test
16. Picked last on a team
17. Losing in a game
18. Giving a class report
19. Going to a dentist
20. New baby