Castle, Season 5

Castle:
My little girl is going to college.

Martha:
Seems like just yesterday you were checking under the bed every night promising her that monsters aren't real.

Castle:
I lied. Monsters are real. They're the boys in her freshman dorm.

Martha:
Oh, speaking of which, before Alexis leaves, don't you think you should have then, um... talk with her.

Castle:
You mean the sex talk? Mother, I covered that ages ago. I learned so much.

Martha:
I mean the you and Beckett sex talk.

Castle:
Mother, Beckett and I haven't...

Martha:
Save it. Richard. I knew the morning I walked in here and the poor girl was hiding in the closet.

Castle:
How did you know that?!

Martha:
Mothers know these things. But I don't think you want Alexis to walk in unannounced and find you and Beckett... out of the closet. And by out of the closet...

Castle:
I know, I know what you mean by out of the closet.

Martha:
So, don't you think you should tell her?

Alexis:
Tell me what?