Why is the woman angry with her son?

M: You look furious, Mary. How come?
W: My son had an accident. He wasn’ t hurt, but my car was damaged.
M: But it wasn’ t too bad.
W: Sure. But he is still taking driving lessons. He just ignored my warning.
M: He should have known better.

M: Mary, a recent study on job interviews says the best meeting time is between 9 and 11 in the morning, and the worst is after 3 in the afternoon.
W: Good news indeed. Mine is at 10 a. m.
M: Oh, you are lucky.