From the "Pretty in Pink" movie soundtrack, this song was played during the final scene of the film...originally they had used "Don't You Forget About Me" by Simple Minds but ended up having to replace it with "If You Leave"...the editor of the film did a horrible job of fitting in "If You Leave" because everyone seems to dancing out of sync with the music. Here's Orchestral Manoeuvres in the Dark's video version: