The way I work is — I want to not have external stimulation. You can kind of see, on the walls are this light green. I'm told that at mental institutions they use that on the walls. It's like a calming color, it's not something that really stimulates you. What you can't see is the computer here, you only see the screen, but the main thing I worry about in my computer is — it doesn't have to be big and powerful, although I like that — it really has to be completely silent. I know people who work for Google and they have their own small data center at home, and I don't do that. My office is the most boring office you'll ever see. And I sit there alone in the quiet. If the cat comes up, it sits in my lap. And I want to hear the cat purring, not the sound of the fans in the computer.

I’m still astonished that somebody would offer me a job and pay me to do what I wanted to do. And to this day, that’s been the astonishment of my life, and delight of my life, and the wonder of my life, and the puzzlement that anybody would be so stupid as to be willing to do that. I hear all these success stories of people, these captains of industry, these forgers of the world, and empire builders and so on. And they talk about all the money they’ve made and become presidents and all that, and I thought, jeez, but look at me. When I was offered a chance to be head of studios I wouldn’t take it. I like to work with the tools of my trade. The tools of my trade is a lot of paper and a pencil, and that’s all it is.

Charlie and I decided long ago that in an investment lifetime it's just too hard to make hundreds of smart decisions. That judgment became ever more compelling as Berkshire's capital mushroomed and the universe of investments that could significantly affect our results shrank dramatically. Therefore, we adopted a strategy that required our being smart - and not too smart at that - only a very few times. Indeed, we'll now settle for one good idea a year. (Charlie says it's my turn.)

There’s no such thing as cheap food. It can be affordable, but it can never be cheap. I think that’s something we’ve been indoctrinated by fast food culture to believe, that it can be cheap – that it can be fast, cheap, and easy. But every culture since the beginning of time has thought of food as something precious, and that’s the way I think about it. I want to give my money to the people who take care of the land, and who grow that food.

They’re very quiet coffee shops, and there are some positions in which it’s easier to write. Somewhere there’s an outlet, and you can keep your back to people. I’ll write for about two hours and then get up and walk with my iPad to the next coffee shop, about 10 minutes away. When you walk, you get a little fresh air, and I’ve heard moving around is good for you while writing. When you write in an office or at home, you end up sleeping. You can’t sleep at a cafe since you can’t lie down. I think that’s good, and it’s become a habit. I wrote Parasite half in Seoul and half in Vancouver.

I’m a rather slow writer and I have to go to a coffee shop. I turn my back to the crowd in the cafe, so that everyone’s chatting and the noise of the place rises behind me, and then I just keep my head down and churn out my screenplay. I can’t write at home, because I get too lazy. I’ll just want to watch TV or fall asleep. But I’m not allowed to lie down and fall asleep in the cafe, right? So it kind of forces me to work.

I wanted to create a very delicate and detailed film where you would feel like you could even smell every single character.