(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

Castle: I am not saying I can speak with the dead, just that there are people in the world more sensitive than me.
Beckett: Now that's not hard to believe.
Castle: Walked right into that one.
Ryan: uh huh.

You're bribing me with a latte?

Beckett