17. On alcohol.

16. On the art of keeping schtum.

15. On ego maintenance.

14. On listening.

13. On discreetness.

12. On dinner.

11. On the inner man.

10. On sitting.

9. On the consequences of nagging.

8. On cooking.

7. On banal conversation.

6. On secrecy.

5. On make up.

4. On underwear.

3. On widening your interests.

2. On infidelity.

1. On vitality sucking.

H/t Mentalfloss and 9GAG.