Not a scientific list, and I composed it during a long cab ride so it’s not even my own accurate estimation. Presented in alphabetical order, because it’s not a contest after all.
1. All Quiet on the Western Front
2. Beauty and the Beast (“La Belle e La Bette,” Jean Renoir)
3. Blow Up
4. Bride of Frankenstein
5. Bringing Up Baby
6. Dr. Strangelove
7. King Kong
8. Seven Days in May
9. Seven Samurai
10. Star Wars
Honorable Mentions (off the top of my head):
Tokyo Story; The Virginian; The Maltese Falcon; Umberto D; The Pickpocket.
(Great? Not Great? Who knows? But lots of fun.)
Point Blank; Grand Prix; War Games; Bullitt; Strategic Air Command; Sunshine; Lifeforce; Starship Troopers
Anything to add, my esteemed and cherished friends?