Castle: I so wish I could kiss you right now.
Beckett: Yeah, I know.
Castle: This is me, softly touching your face, pulling you in for a long slow kiss.
Beckett: This is me, kissing you back, running my fingers through your hair.

The butler did it!

Castle

How can you be so smart and so clueless at the same time?

Alexis

Beckett: Do you think I should talk to her?
Castle: No, she will eat you alive.

Take your hands off your tool, Marco!

Beckett

Castle: You owe me big time.
Beckett: I don't know if the department can reimburse you for all of this.
Castle: That's not the kind of owing I'm talking about.

Esposito: Who knew that Gates had a softer side?
Ryan: It's creepy. Very, very creepy.

I'm a best selling author. Why wouldn't I have two grand in my pocket?

Castle

So how did she take it, us being together?

Beckett

I'm getting soft.

Castle

My little girl is going to college.

Castle