Sherlock, Series 1

Sherlock:
No. No, there's something else. You haven't killed four people because you're bitter. Bitterness is a paralytic - love is a much more vicious motivator. Somehow, this is about your children.

Taxi Driver:
Oh, you are good, aren't you?

Sherlock:
But how?

Taxi Driver:
When I die, they won't get much, my kids. Not a lot of money in driving cabs.

Sherlock:
Or serial killing.

Taxi Driver:
You'd be surprised.

Sherlock:
Surprise me.

Taxi Driver:
I have a sponsor.

Sherlock:
You have a what?

Taxi Driver:
For every life I take, money goes to my kids. The more I kill, the better off they'll be. You see? Nicer than you think.

Sherlock:
Who would sponsor a serial killer?

Taxi Driver:
Who would be a fan of Sherlock Holmes? You're not the only person who enjoys a good murder. There's someone else out there, just like you. Except you're just a man. And he's so much more.

Sherlock:
Who? What do you mean, more? Who is he? Tell me.

Taxi Driver:
There's a name that no one says. I'm not saying it either. Now. Enough chatter. It's time to choose.