Sliding Doors - 1998

Sliding Doors is a 1998 British-American romantic comedy-drama film written and directed by Peter Howitt and starring Gwyneth Paltrow and John Hannah, and featured John Lynch, Jeanne Tripplehorn and Virginia McKenna. The music was composed by David Hirschfelder. The film has elements of alternate history, though on a minor level, affecting only the personal lives of the (fictional) characters and not the world at large.

I love this film. It makes you wonder what might have been in your own life. It's funny in parts and quite dramatic in others. Outstanding.