Phone call

A.: Hello?
Mom: Where are you?
A.: Home.
Mom: Then what's that noise?
A.: I don't hear anything.
Mom: There's a noise.
A.: I don't know.
Mom: Anyway, that plant that you had--that I also have... ours is thriving. Some of our other plants are having a harder time, but that one's just fine. When exactly did you take it in for the winter?
A.: I don't remember, mom. That one died a while ago.
Mom: Well, about what time of year did you take it in?
A.: I don't know. It was over a year ago.
Mom: Roughly when?
A.: I DON'T KNOW, MOM! I don't remember.

If I don't remember something, how is repeating the question is going to help me remember? Why are you calling me at 9pm to ask me the same question three times?