(to Kate about marriage) You'd be good at it. You're both controlling and disapproving. You should really try it.

Castle: We could always make it strip poker.
Kate: Sorry, but I prefer mystery to horror.

Kate: Okay, Castle, but it's accompany and observe, not participate and annoy. Got it?
Castle: Participate and annoy is a lot more fun, but alright.

Castle: So. Looks like I managed to make it through the case without getting injured, shot or killed.
Kate: Yeah, well, maybe tomorrow.

Castle: That's too easy. The reader would never buy it.
Kate: This isn't one of your books, Castle. Out here, we find a guy standing over a body with a gun, he's usually the guy who did it.

Kate: Are you here to annoy me?
Castle: I'm here for the story.

Castle Quotes

I don't get it. He's into you and your determined not to give into these feelings that you clearly have for him. So he fantasizes about you through his writing. It is literally verbal masturbation.

Natalie

I can't tell you how many times I've had dreams of being on this very ship.

Beckett