It starts off seething and whispered, her grip white-knuckled on the steering wheel, but it has reached “inside voice” by the time they hit the main road. Then “outside voice” by the time they turn onto their street. And finally “concert shrieking voice” by the time they park on the curb in front of their house. The actual words circle around three main themes: How could you be so reckless? Followed by What if you had died? And lastly, Why didn’t you tell me? Once Mom reaches the end of those subjects, she loops back to the start.