First off, if you don't know what contrapuntal music in film is (correct me if I'm not explaining correctly): Music opposite to the emotion expected from the narrative. So for example, to put it plainly, fun music over a sad scene.
I just watched "9" and I loved the sound. Specifically, I loved one scene where they used contrapuntal music. The song was (somewhere) Over The Rainbow, which was [stop reading here if you haven't watched it] used diagetically when they where celebrating their victory and everything is hunky-dory but then they get attacked again but the beautiful music keeps playing over part of the attack. I thought it was a very well crafted scene.
Over The Rainbow: http://www.youtube.com/watch?v=F0-um0pHTAg
Trailer for "9": http://www.youtube.com/watch?v=OnoJecu9e7c
At film school, I went through a contrapuntal phase, but I haven't had the opportunity to use it since. So my question is:
Have you used this technique for your films (any thoughts on it)? And what are your favorite films that use it?