Poll: Most romantic movie for adults

By that I dont mean, "oh em gee he/she is sooo cute, they do such cute things, this movie is SOOO romantic!"

I mean a movie that 30 year olds can appreciate. deally, something that deals with love all the way to full on Marriage levels, where the characters face difficulty in their relationship, but come through it in a warm and endearing way, bringing them closer together than ever.

I'll start.
My favourite grown-up romantic movie:

Mr and Mrs Smith. (Edit: 2005 version)

I'm serious! 🙂

HJow about yours?