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

Yeah, well separated twin stories never end happily, except for The Parent Trap!

Castle is famously fatherless.

Beckett

Ryan:Deep fried twinkie?
Castle:'Fraid so.

Kate, you should go. He needs you.

Javi

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

Baby bird?

You got this.

Castle (to Beckett)

I don't want to lose what we have.

Beckett

I'm protecting the man who killed my mother.

Beckett

How do you like my naval ring?

Beckett

Castle: Ryan, you played the C card?
Ryan: You weren't around. Somebody had to step up.

Castle Quotes

Sometimes the hardest things in life are the things most worth doing.

Castle

Castle: You're not alone in this. I'm here.
Beckett: I know.