Castle: I’m sure after all this, you’re a little sorry you let me follow you around.
Beckett: No, not this. All the other annoying things that you do, but not this. What about you? Are you sorry that you ever wrote Heat Wave?
Castle: The way I look at it now, if it wasn’t for Nikki Heat, this guy would’ve just gone on killing because he wouldn’t have met anyone smart enough to catch him. (Beckett smiles) I’m speaking, of course, about Special Agent Shaw. (She throws the towel at him)
Beckett: Good night, Castle.
Castle: Good night.