The song Decadence by the Pet Shop Boys, which was released as a b-side of the single Liberation, came about after the Pet Shop Boys were approached to write the theme song for the Steven Berkhoff film Decadence, an adaptation of his play starring himself and Joan Collins. Neil and Chris wrote the song in the studio in about two hours. Later Neil saw a rough edit of the film, which he didn't particularly like, so they decided not to put the song forward.
The song In Private by the Pet Shop Boys, which was recorded by Dusty Springfield and which was released as a single and on the album Reputation, was originally written for the film Scandal about the Profumo Scandal. But the producers thought the song sounds too contemporary and so this song isn't in the film. The other song written for this film, Nothing Has Been Proved, was used (see).
The Life And Loves Of A She-Devil
Pet Shop Boys were asked in the late Eighties of they'd be interested in writing the music for The Life And Loves Of A She-Devil, the film version of a book by Fay Weldon, starring Meryl Streep. They were to write and perform an instrumental soundtrack and a theme song. They read the script and like it tremendously and even started work on some music for it but then they decided that it would take too long, that they didn't really want to put out an LP full of instrumental music and that they'd be more sensible to concentrate on their next proper LP.
The Living Daylights
Music for the song This Must Be The Place I Waited Years To Leave (released on Behaviour) was originally written in in 1986. At the time it had been intimated to the Pet Shop Boys that they might be asked to write the theme song for the James Bond film, The Living Daylights, so as a musical exercise they decided to write something that sounded, in their opinion, like a James Bond theme. But they never heard anything from the James Bond people.