OK, well here's a "Top Twenty" from me...

1. Being There (1979)
2. High Fidelity (2002)
3. A Man For All Seasons (1966)
4. Witness for the Prosecution (1957)
5. A Night To Remember (1958)
6. The Magic Christian (1969)
7. A Clockwork Orange (1972)
8. The Party (1968)
9. Who's Afraid of Virginia Woolf? (1963)
10. The Taming of the Shrew (1967)
11. Amadeus (1981)
12. The Exorcist (1973)
13. Guess Who's Coming to Dinner? (1965)
14. One Flew Over the Cuckoos Nest (1971)
15. Dr Strangelove (1964)
16. On Golden Pond (1981)
17. The Silence of the Lambs (1990)
18. Monty Python and the Holy Grail (1975)
19. Allegro non Troppo (1977)
20. Brief Encounter (1946)

Share your Top Twenty!!! (or whatever number you want). I always feel that twenty lets me get things off my chest, whereas five is impossible to decide on (see John Cusack in High Fidelity!)