My five-year-old looked at a traffic light and said, 'Dad, why does the light change?' I said, 'So cars can go safely.' He said, 'It's not a safety issue. It's a mood issue. The light is in a good mood, the light is in a bad mood. It's not traffic. It's the light's emotional state. I'm not waiting for a green light. I'm waiting for the light to feel better about itself. I'm waiting for the light to have a good day. And then maybe it'll let me cross the street.'