It's not a sweat shop, it's a sex shop.

An officer and a gentleman. That could be the name of our crime log.

She's the best.

Castle (about Beckett)

Castle: I hate going to weddings alone.
Beckett: Well maybe we could be each others' plus ones.

Beckett: That's espionage.
Castle: More like sexpionage.

Beckett: Castle, if we were getting married, would you want to know about all of the men I've been with?
Castle: ALL sounds like a lot.

Beckett: Oh my God, that's Jenny!
Castle: Not just Jenny. Gyrating Jenny.

Castle: If you find out a man is cheating on you, how would you kill him?
Martha: Knife.
Alexis: Shoot him.

It's like the beginning of The Bachelor, but without the appletinis.

Speaking of sweet...who's your date to Ryan's wedding?

Castle: I always liked your legs, but now I respect them.
Beckett: Yours aren't so bad either. For the next police picnic, we should enter the three legged race.

If we ever get out of here, we should seriously consider joining the circus.

Castle Quotes

Castle: How do you know when you're in love?
Beckett: All the songs make sense.

Back stabbing, adultery and betrayal. That is why I hate politics.

Kate Beckett