Too difficult, this question.
Well, hers a list of my favourites (no perticular order)
The Lord of the Rings Triliogy
Monty Python - Holy Grail and Life of Brian
Back to the Future
LA Confidential
Starwars Triliogy (old ones - Empire and Jedi are the better ones)
Startreks II (the wrath of Kahn) VI (the undiscovered country) and VIII (first contact)
The Matrix (just the first one)
Piarates of the Carribbean
Apollo 13
The Usual Suspects
The Hunt for Red October
Airplane
I could go on for hours, but those are the first that occur to me!