Take a movie title and alter it to be the punchline of a joke but still recognizable as to what movie it refers.
For example:
When an investment banker played by Pierce Brosnan and an insurance investigator played by Rene Russo decide to have children, they realize their busy schedules require that they hire some live-in help to assist them. That person is referred to as “The Thomas Crown Au Pair.”
Then there was the Von Trapp family dog. They called him “The Hound of Music.”