Sherlock Holmes and Irene Adler in “Unfinished Business”

Sherlock Holmes

Sentiment is a chemical defect found in the losing side.

Irene Adler

Sentiment? What are you talking about?

Sherlock Holmes

You'

Irene Adler

Oh, dear God. Look at the poor man. You don't actually think I was interested in you? Why? Because you're the great Sherlock Holmes, the clever detective in the funny hat?

Sherlock Holmes

No...[Takes her hand and leans in to whisper] because I took your pulse. Elevated. Your pupils dilated. I imagine John Watson thinks love’s a mystery to me, but the chemistry is incredibly simple and very destructive. When we first met, you told me that a disguise is always a self-portrait, how true of you, the combination to your safe – your measurements. [Holds up her phone] But this, this is far more intimate. This is your heart, and you should never let it rule your head. [He starts entering digits] You could have chosen any random number and walked out of here today with everything you worked for. But you just couldn't resist it, could you? I've always assumed that love is a dangerous disadvantage. Thank you for the final proof.

Irene Adler

Everything I said. It's not real. I was just playing the game.

Sherlock Holmes

I know. And this is just losing.