Robert Pattinson has revealed that he was so worried about playing billionaire Wall street CEO Eric Packer in the movie ‘Cosmopolis’, that he locked himself for a fortnight in his hotel room. But, the ‘Twilight’ star was calmed down by the movie’s director David Cronenberg who reassured him that his talent would bring out the best in his alter-ego. “The preparation, I kind of spent two weeks in my hotel room worrying and confusing myself. I remember the weekend before we started shooting, I called David to talk to him about it, to ask him ‘one question’ like, ‘Want to talk about the movie for a bit?” Contactmusic quoted him as telling FlicksandBits.com. “So then I went round to David’s house and he said, ‘It doesn’t really matter. Let’s just start, then something will happen.’ I think Eric Packer’s impossible to approach like you would a normal character,” he said. The 26-year-old felt the film script was more like lyrics from a song, which he found “easier” to comprehend and as a result he didn’t want to alter any of the words. “What I liked about the script initially was its lyricism and just the rhythms of it. I mean, normally when you do a movie, you can kind of blur the lines and you can make it your own. But with this, I didn’t want to change a single word, not even the punctuation,” he said. “That made it easier, it’s like you’re doing a song instead of a movie. It was interesting, it freed you up. If you’re trying to do something in a cerebral way, it becomes about ego and it’s silly at that point. Actors aren’t supposed to be intelligent,” he added.