For my own reference (since I was asked in class recently), in no particular order:

1. Before Sunrise (and its sequels Before Sunset and Before Midnight)
2. Hable con Ella (in English, Talk to Her)
3. Twin Falls Idaho
4. The Rock (even if it’s super mainstream, there’s something about it that I really love—maybe it’s Sean Connery?)
5. Good bye, Lenin!
6. Say Anything
7. Zombadings!
8. Battle Royale
9. The Departed (yes, even more than the movie it’s based on, Infernal Affairs)
10. The Conversation

Honorable mention (aka movies I used to say were my favorites, but now I am not too sure anymore): Finding Nemo, Seven, Run Lola Run, Inception, The Shawshank Redemption, Gravity (undecided)