what episodes do these moments occur in?? 

I guess some obsessions can be useful....

This link rocks. So many good memories!

1. Forever 2x22
2. Three Stories 1x21 and House's Head 4x15
3. Skin Deep 2x13
4. Act Your Age 3x19
5. Merry Little Christmas 3x10 (could be Words & Deeds 3x11. I didn't have time to watch the episodes)
6. Wilson's Heart 4x16
7. No More Mr. Nice Guy 4x13
8. Insensitive 3x14
9. Humpty Dumpty 2x03
10. Who's Your Daddy? 2x23
11. Fetal Position 3x17
12. Babies & Bathwater 1x18
13. Love Hurts 1x20
14. One Room One Day 3x12
15. Top Secret 3x16
16. Half-Wit 3x15
17. House's Head 4x15
18. Ugly 4x07
19. Detox 1x11
20. Aireborne 3x18