You Haven't Seen What?

What movies have you never seen that you KNOW you should have by now? Or movies you are embarrassed to admit passed you by? My list is pretty epic but I'm putting it out there! I'm not going to go by category or by decade, this list is by no means all-encompassing, I'm sure there are other movies out there I haven't seen that I forgot to put on this list.

1. Easy Rider
2. Apocalypse Now
3. Taxi Driver (I started this one but couldn't get into it)
4. Amelie
5. Full Metal Jacket
6. Casino
7. Any & all Sergio Leone movies w/Clint Eastwood
8. Dirty Harry & its sequels
9. Unforgiven
10. Mulholland Falls (pretty much any David Lynch film)
11. The Hustler
12. Rebel Without a Cause
13. On the Waterfront
14. Aliens (forced to watch the first one in film class & cried I was so scared. I'm a little girl when it comes to horror movies)
15. The Shawshank Redemption
16. West Side Story
17. Schindler's List
18. Sunset Blvd.
19. Wall-E
20. The Rocky Horror Picture Show

I'm going to stop here because I'm starting to have trouble thinking of movies. What's your list?