Some all-time favourites:
Willy Wonka & the Chocolate Factory
The Shawshank Redemption
Withnail & I
The Conversation
Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb
Groundhog Day
The Blues Brothers
The Princess Bride
From Here to Eternity
Toy Story
X: The Man with the X-Ray Eyes
When Harry Met Sally...
Monty Python and the Holy Grail
Brazil
Saturday Night Fever
Before Sunrise