Win 1 of 10 Copies of The Vow on DVD Cosmopolitan

Inspired by a true story, The Vow is the tale of a love that refuses to be forgotten.
Leo (Channing Tatum) is devastated when a car accident plunges his wife (Rachel McAdams) into a deep coma. She miraculously recovers- but the last 5 years of her memory has vanished. Suddenly, Leo finds himself married to a stranger who can't remember anything about him…
We have 20 dvd's of this romantic-hand-me-the-tissues movie to give away. To get your hands on a copy simply answer in 25 words or less- what's your favourite romantic movie and why?