Keira Knightley has changed her mind about trying her hand at comedy - insisting she's "too dark" to pull it off. The actress recently announced plans to ditch romantic and period dramas for funny films, after being inspired by Will Ferrell in Blades of Glory. She said, "I always say I've no interest in doing a comedy because I don't watch very many. But actually I think I am lying because the other day I saw Blades of Glory and thought it was brilliant." But the 22-year-old has decided to stick with what she knows best: "I'm too dark in my soul to ever do a comedic role. I'm afraid I'd make a fool of myself."