It really is hard to get a list like this down to 5 or even 50. The best thing about these lists is to get us remembering the movies and the memories they evoke.
For me, in no particular order
One Flew Over the Cuckoos Nest
Cool hand Luke
Blade Runner
Chinatown
Treasure of the Sierra Madre
I'll think of 5 new ones as soon as I post this.
A Happy and Healthy New Year to all.