A: Did you see that car? B: Yes, he went through the red light. A: Can we call the police? B: No, the police don't care. A: Why not? B: They have to see it happen. A: They don't believe us? B: No. They can only give a ticket if they see it happen. A: So, what do we do? B: We don't do anything. A: Maybe we should honk the horn next time. B: The driver will just honk back at us.