It happens every so often, and I'm trying to remember more.
So far i have....
"Singing in the Rain" because of Clockwork Orange
"Stuck in the Middle" - Reservoir Dogs
"Young Americans" -Dogville
"Walking on Sunshine" -American Psycho
Try it, it's fun!
It can't be a song that was made just for the movie. Only an existing song.
I also noticed i only thought of happy songs that were forever changed because of their ironic use during violence. I wonder if it ever goes the opposite way?