This is the worst impromptu bachelor party while on case ever!

We're not going to be seeing Carrot Top tonight, are we?

Trust me, you do not want to start a marriage with a family feud.

It's almost like the thought of marriage fills him with an impending sense of doom. Oh wait, that's me!

Let's not let a little thing like murder get in the way of having a good time.

The last time I saw you in your pj's after eight am I think you were four.

Even as a hostage I help you solve murders. Beckett, I think you have the perfect partner.

Why Doogie Howser? There is so many cool TV doctors. Dr. House...Dr. Shepherd...

Castle: Tell me you need me.
Beckett: Excuse me?

Any relationship that lasts longer than a breath mint is going to have challenges.

You? Skepticus Maximus?

Beckett: I'm sure there's a perfectly good explanation for all that.
Castle: There is...they're here!

Castle Quotes

I can't help it if you got off by putting things in my mouth.

Beckett

Castle: They're going to kill you Kate, and if you don't care about that, please think about how that's going to affect the people who love you. You really want to put your dad through that? What about Josh?
Beckett: And what about you Rick?
Castle: Well of course I don't want anything to happen to you. I'm your partner, I'm your friend.
Beckett: Is that what we are?
Castle: You know what? I don't know what we are. We kiss and then we never talk about it. We nearly die frozen in each others arms, but we never talk about it. So no, I got no clue what we are. I know I don't want to see you throw your life away.