My thoughts can change week in week out...

Books:

1: Queer by William Burroughs
2: Nausea by Jean Paul Sartre
3: 1984 by George Orwell
4: Great Expectations by Charles Dickens
5: The Picture of Dorian Gray by Oscar Wilde

Films:

1: The Godfather Part 2
2: Groundhog Day
3: Lost in Translation
4: Psycho
5: Breakfast at Tiffany's

I like loads of other stuff but a top 5 of everything is too much for one day.