This is my favourite game. So what comes into mind...

1. The opening sequence
2. The Gardens
3. The character development
4. Zell - I loved this guy. His outbursts were some good comic relief
5. The junction system
6. Card Mod
7. Triple Triad - Best minigame ever
8. Tri-face
9. Malboros opening noise - sounds like a weird laugh
10. Getting the items for remodelling the weapons
11. Seifers character design as said before & his fighting stance
12. Character designs in general. I think this game doesn't even look that out of place by todays standards
13. Dance with the Balamb-Fish. My favourite FF song ever for some strange reason
14. Fishermans Horizon - The music that goes with this makes it amazing
15. Nobuo Uematsu - The music in this game is flawless as usual with this man
16. Ultima & Omega Weapon
17. Gilgamesh scene with Seifer
18. Adel
19. In Space with the Ragnarok
20. That little bump sound that Squall makes when he hits his gunblade off Zells head
21. Squall rescuing Rinoa from the sorceress memorial
22. The orphanage scene
23. I know that some people dislike Squall, but I loved him as the main character. I was annoyed with him at times but the way he redeems himself at the end is one of the reasons I love this game.
24. SeeD Test
25. Mug
26. Spd-J
27. Cactuars
28. Moombas
29. As someone said before, I liked the way it left you to fill in the blanks with some things.
30. Last but not least, the ending. Perfectly summed up the story. Again, it had beautiful music.

I'll leave it there. I actually did that pretty quickly.