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I was frustrated with the results, but it occurred to me that there was no solution as long as my job was trying to imitate someone else’s voice. The obvious solution was to find a situation where I was doing me, not someone else. The major obstacle to this is your deeply seated belief that “you” is not interesting.

[…]

I wrote Being John Malkovich while I was waiting for [the next sitcom] hiring season. My idea was that I would write a script and use it to get work. I had this idea that someone finds a portal into someone’s head, and I had another idea that somebody has a story about someone having an affair with a co-worker. And neither one was going anywhere, so I just decided to combine them.

It got a really positive response. I started to get a little known. People would read it and tell me how funny it was, invite me for meetings, tell me nobody would ever make the movie. I had maybe 15 meetings like that, so I wasn’t really expecting it to get made. Then it got to Spike Jonze, and he was in a position to get a movie made. I didn’t really expect it to be anything. I don’t think Spike did either. I remember it going to the Venice film festival, which was the first exposure it had. I wasn’t invited, but they went: Spike and Cameron Diaz and Catherine Keener. I just got a phone call saying that it was this big thing, and then all these articles got written about it. It was exciting.

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— Guardian: Charlie Kaufman: why I wrote Being John Malkovich