"Success is absolutely intoxicating. I've seen people behave in ways that seem very far from how they would behave normally."

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I think sometimes it's sort of easier to be playing a role based on a real person because there's quite often a lot more information, you're not making it up, it's there in books, it's there in research form. But really the questions you ask about the character, and why people behave, and where they come, and how they've ended up in the places they've ended up are the same.

— Keira Knightley