This is such a hard question - there are so many good films, my favourites change all the time!
Strangely, I find it easier to remember my least favourite films:
Blackhawk Down - botch-job US-style becomes box-office hit
AI - nearly accidentally slashed my wrists at the end of this one
But here are three of my favourites:
American Beauty - unconventional and deliciously disfunctional
Amelie - heartwarming
and then there's a toss-up between
The Matrix (groundbreaking) and
Mr & Mrs Smith - sizzling! not the greatest plot, but it's hard to decide which one is more fanciable!!