Castle Season 4 Episode 10

Castle: Tell me this why do you always have to be first? First out of the elevator, first through the door.
Beckett: Um, I am a cop. I'm the one with a gun. Being first through the door is my job.
Castle: In the elevator? Look, how about this? Would it kill ya'to let someone open the door for you once in a while?
Beckett: You do realize, if somebody opens the door for me, then I will be going through it first anyway, right?
Castle: Oh, yeah, that's right. I forgot. You have to be the smartest, too. Everything's a competition with you.

Beckett: What was so special about our victim that our killer wanted to erase his identity? Don't say spy. Or mob hit.
Castle: Mob hit of a spy?

Castle: (at the crime scene) You know what I love about working with you? You always take me to the most charming places.
Beckett: Well, I'm a simple girl, Castle. I go where the bodies are. Besides, for a mystery novelist, aren't seedy motels kind of a standard?