Pick a movie, change the director.
Pick a movie that you think would be interesting with another director. The movie doesn't have to be bad, but more of a "it would be interesting if so and so directed this movie". Try to keep it realistic. Don't say something like Alfred Hitchcock directing Titanic because he wouldn't have been alive when the film came out.
Magnolia - Ingmar Bergman
Rocky - Martin Scorsese
Eternal Sunshine of the Spotless Mind - Spike Jonze
Heat - David Fincher
Back to the Future - James Cameron
Pan's Labyrinth - Tim Burton
Parasite - Paul Thomas Anderson