https://www.youtube.com/watch?v=pCbi6whsdIw
The Outside Man is an offbeat 1972 French-made film which happens to be set in Los Angeles and stars noted French actor as Jean-Louis Trintignant as a hitman. At one point in the story, his character takes a mother and her young son hostage. The kid just happens to be played by 11-year old Jackie Earle Haley in his film debut and in this clip, the hitman slaps him silly for eavesdropping. According to Haley, during the filming of the scene, Trintignant just decided to slap the shit out of him for real.