Watching Oliver Stone's JFK

Another scene in movies I'm declaring a moratorium on is the courtroom scene where as the lawyer (main character) is speaking to the jury (even better if it's his dramatic closing statements), and the door opens and in walks his wife/partner/assistant who in a previous scene had stormed out in a huff, furious at the lawyer for being foolish enough to take the case, yada yada. Lawyer pauses, locks eyes with person, slightly smiles and then goes on talking. Is there a law that a movie featuring a lawyer has to include this scene? Yes, I'm sure this happens in real courtrooms ALL THE TIME. Christ. Never again! Please!