Bart's Blackboard gag opening in The Simpsons' is an iconic scene, and every scene is different. And in every message, while being funny, is a also a life lesson buried somewhere there. Here are some of them we've learned so far. Check them out:
1. On excuses:

2. On respect:

3. On cutting corners:

4. On hygiene:

5. On science:

6. On education:

7. On getting favors done:

8. On showing off:

9. On assigning blame:

10. On manners:

11. On the Internet:

12. On making fun of history:

13. On playing with your food:

14. On discipline:

15. On creating excuses:

16. On bullying:

17. On religion:

18. On the use of proper grammar:

19. On reading:

20. On subliminal messages:

21. On playing pranks:

22. On dealing with loss:

23. On telling lies:
