Mycroft Holmes: Don't be smart.
Sherlock Holmes: That takes me back. 'Don't be smart, Sherlock. I'm the smart one.'
Mycroft Holmes: I am the smart one.
Sherlock Holmes: I used to think I was an idiot.
Mycroft Holmes: Both of us thought you were an idiot, Sherlock. We had nothing else to go on till we met other children.
Sherlock Holmes: Oh yes, that was a mistake.
Mycroft Holmes: Ghastly. What were they thinking of.
Sherlock Holmes: Probably something about trying to make friends.
Mycroft Holmes: Oh yes. Friends! Of course you go in for that sort of thing now.
Sherlock Holmes: And you don't? Ever?
Mycroft Holmes: If you seem slow to me, Sherlock, can you imagine what real people are like? I'm living in a world of goldfish.