What really makes a movie scary? Is it monsters and gore, or the kind of psychological thriller that gets into your brain and keeps you up at night? The answers are all subjective, which makes our bracket to determine the scariest movie of all time even more exciting. One of the hottest matchups right now is between Psycho and 28 Days Later. The two films couldn't be more different, except that they both gave me some pretty serious nightmares. Be sure to weigh in on the debates with your own picks and remember — there's a big prize in it for one lucky winner!