Sherlock, Series 2

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.

[She grabs his hand, desperate. Tears are starting to form]

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

Sherlock Holmes:
I know. And this is just losing.

[He holds up her phone, having finally deduced her password. It reads I AM S-H-E-R LOCKED]