Oh, these happy family reunions.

Talking about "The Curious Case of Benjamin Button"...
Me: You know Elle Fanning was in that.
Adam: I guess. She didn't even have any lines.
Me: Yes, she did. I saw her part.
Adam: No, she didn't. They had Keira Knightley do her voice.
[pause]
Me: Keira Knightley?
Adam: [pissed] I don't know what her name is!
Me: You mean Cate Blanchett? Is that who you mean?
Adam: I said I don't know her name.
Me: They didn't have Cate Blanchett do her voice. They had them both record the lines, and then they combined her voice with Elle Fanning's.
Adam: Oh.
Me: You thought Cate Blanchett was Keira Knightley? That's a new one. I'll have to tell Sara that.
Adam: Yes, I'm sure you will. [sighs angrily]
Me: [laughing hysterically] Boy, you haven't changed a bit.