I think that the benefit of playing someone like Queen Elizabeth is that so much has been written about her, and there's so much speculation about her - was she a hermaphrodite? She's so mythologised, and there are a lot of images of her.
I think the height of ridiculousness was when I was playing Elizabeth in 'The Golden Age' while preparing to start shooting 'I'm Not There.' I literally finished filming Elizabethan grandeur on Friday, flew to Montreal, and started being Bob Dylan on Monday.