Laughing and crying are really similar - what happens to your body. It's a very similar process in your diaphragm. Like a musician, you have to do your scales once in a while and warm up your voice.

I love doing impersonations of people.

My first agent dissuaded me from calling myself 'Cumberbatch.' I had six months of not very productive time with her, so I changed agents. The new one said, 'Why aren't you using your family name? It's a real attention-grabber.' I worried, 'How much is it going to cost to put my name in lights?' But then I decided that's not my problem.

I was never geeky about anything.

I still find to give an interview to be difficult, as any person who deals with the press will tell you. That's why it's nice, with this one, to talk to a friend. But sometimes with a coffee and a friendly smile, I suddenly start talking without thinking about how it's going to be read.

The story [in 12 Years a Slave] serves as a metaphor for the fear of having your family taken away, and for being abused in such a horrific way. I lost it a lot of times watching that film, particularly when seeing the grace of the man when he finally makes it back home aged, changed, forever brutalized, and yet he apologizes to his family for his long absence. That was such a profoundly moving moment capturing the triumph of dignity over the disgraceful behavior of those involved in the slave trade.

There's a heroic amount of effort that goes into making him [Doctor Strange] a superhero by the end of the film.