01.
02.
03. Liam cooking for Annie/Charlie arrives - 3x04 - The Bachelors
04. Bathroom interaction - 3x04 - The Bachelors
05. Sleeping together - 3x11 - Holiday Madness
06. Annie taking care of Liam - 3x11 - Holiday Madness
07. "Boat date" - 3x02 - Age of Inheritance
08. Liam follows Annie - 3x04 - the Bachelors
09. Liam staying at Wilson's house - 3x04 - the Bachelors
10. A :"I'm gonna stop seeing Charlie" - 3x04 - The Bachelors
11. Annie asking Liam for a ride - 3x01 - Senior Year , Baby
12. Liam asks Naomi for a permission to date Annie - 3x02 - Age of Inheritance
13. A :"You don't wanna deal with these fists of fury" - 3x11 - Holiday Madness
14. Lannie "locked" together in a class - 3x01 - Senior Year , Baby
15. A : "Hey ,Liam!" ; L: "Screw you" - 3x01 - Senior Year , Baby
16. Lannie under the table - 3x01 - Senior Year , Baby
17. A: "Are you living in your car?" - 3x05 - Catch Me If You Cannon
18. Liam's trying to make Annie jealous - 3x06 - How Much Is That Liam in the Window
19. Hiding from police/First break up - 3x02 - Age of Inheritance
20. "Locker looks" - 3x02 - Age of Inheritance
21. Liam receives award from Annie - 3x07 - I See London, I See France...

2 perfect scenes , I can't choose
Well choosing this one just because first kiss was better than ILY kiss (or at least the way it was shown :P)
But Liam's love confession is EPIC , best line from 90210

as you said it , ILY was epic :)

it looks like people are seriously conflicted over this choise