[Castle, Beckett, and Ryan are huddled together in the break room]
Javier Esposito: What are you guys doing?
Kevin Ryan: Hiding from creepy Beckett.
Kevin Ryan: [watching Natalie, who is dressed like Beckett, in the bullpen] We really should have a code word so we all know which Beckett to kill when her clone army attacks.
Kate Beckett: Unless we make a preemptive strike.
Richard Castle: [Castle dislikes the actress playing Nikki Heat] Nikki Heat is classy, she's complicated. She's a thinking man's cop.
Kate Beckett: No, we can't judge a book by its cover.
Richard Castle: Yes, actually. Yes, I can, when it's my book.
[after a serious misunderstanding]
Jenny Duffy-O'Malley: I hate you, Kevin Ryan!
Natalie Rhodes: Can I ask you a question?
Kate Beckett: Sure.
Natalie Rhodes: Is Castle gay?
[Beckett spit takes her coffee in surprise]
Kate Beckett: I'm sorry, what? No. No.
Natalie Rhodes: Then you two are an item, but you're... sworn to secrecy, right?
Kate Beckett: No, we are not an item. Why?
Natalie Rhodes: Last night, I invited him back to my place, and he said something to me I have never from a man before.
Kate Beckett: What?
Natalie Rhodes: "No."
Kate Beckett: No?
Natalie Rhodes: I don't get it. He's into you, but you're determined not to give into these feelings that you clearly have for him, so he fantasizes about you through his writing. It's literally verbal masturbation.
Kate Beckett: [in the break room with Castle, watching Natalie at the murder board] Do I really do that?
Richard Castle: Yes. And it's adorable.
Kate Beckett: If it's so adorable, why didn't you sleep with me?
[Castle looks at her in surprise]
Kate Beckett: "Her" me, not "me" me.
Kate Beckett: [Natalie has purchased a costume that resembles Beckett's outfit] You cannot tell me that that is normal!
Richard Castle: She's just committed to the role.
[Castle hurries to follow Natalie out the door]
Richard Castle: You should be flattered.
Kate Beckett: [to herself] Yeah, sure... until she steals my boyfriend and kills me in my sleep.
Kate Beckett: Can we talk for a second?
Richard Castle: Sure.
[Beckett pulls him away from Natalie as fast as she can]
Kate Beckett: She took my coffee, Castle!
Richard Castle: It's just coffee.
Kate Beckett: Then what's next, my soul? Everything I do, she does. Even when I'm thinking, I can feel her in my head like some kind of a brain-eating parasite from one of her movies.