I'm not sure how the conversation got here, but...

Sarah: Do you know my middle name?
Me: Uh...
Sarah: You don't?
Me: Marie.
Sarah: No.
Me: Anne.
Sarah: You don't know my middle name?
Me: You don't know mine.
Sarah: Paul.
Me: Elizabeth? Anne?
Sarah: It starts with a C.
Me: Cathrine.
Sarah: No.
Me: Christine?
Sarah: Yes. It's Christine.
Me: [to myself] Christine. Christine.
Sarah: This is equally sad and funny.