Kate Beckett: Oh, my... God! Oh, my God! You're proposing!
Richard Castle: Okay. You're surprised.
Kate Beckett: Of course I'm surprised! I thought you were breaking up with me!
Richard Castle: By offering you a ring?
Kate Beckett: Well, you just- You seemed so serious!
Richard Castle: Yeah, of course I'm serious. This is the most serious thing I've ever done.