Castle Season 2 Episode 10

Beckett: Well?
Castle: Alexis? She's fine. You know, her first day of preschool, I hid outside in the bushes all day just to make sure she was all right.
Capt. Montgomery: The first time my son went to summer camp, I followed the bus all the way to the Adirondacks.
Beckett: You two are both either very sweet or very creepy.

Castle: You know what math doesn't add up for me?
Beckett: Hmm.
Castle: Two wives.
Beckett: One wife too many for you?
Castle: Two wives too many.
Beckett: Seems like the common denominator in that equation is you.

Alexis: Oh, hey, dad. Did you get a chance to sign that permission slip I gave you the other day?
Castle: Haven't you learned to forge my signature yet?
Alexis: Ah. Credit cards? Yes. Permission slips? No.

Castle: That ever happen to you with me? One day, you look and you see your boy is all grown-up?
Martha: I'm still waiting for that moment, actually.

Castle: I know Alexis already talked to you, I just wanted to make sure that you're really okay having her around.
Beckett: I wouldn't have said yes if I wasn't.
Castle: Well, yeah... You're busy and I just don't want her to get into your way.
Beckett: (smiling) Big Castle is the one who likes to get in the way, I'm sure little Castle will be a pleasure.