Nightcrawler is a brilliant performance trapped in a not quite brilliant film. Jake Gyllenhaal, 30 pounds lighter, is Lou Bloom. Bloom is a psychotic in the guise of an enthusiastic entrepreneur. From the first encounter onward, we know this man is deeply disturbed – his eyes bug out, he speaks in a strange, over-polite, deliberate tone. His sentences seem to come from self-help books. But when he says, 'I'm bold, I'm persistent, I'm self-motivating,' it's unnerving and almost scary.