Les Miserables with Clint Eastwood as Javert and Lee Marvin as Jean Valjean. Clint sings while holding a single shot pistol on Jean Valjean "I know what you're thinking. 'Did he fire one shot or zero'? Well to tell you the truth, in all this excitement, I kind of lost track myself."
Very funny. But here is the trailer for those who want to see it: