The end is unexpected,I didn't pay any attention to Mickey,because he seems unspectular, to my superise, I didn't think the serial killer is Billy's mother,maybe her acting skill is not good enough,at least she didn't scare to me,Sydney's boyfriend, whom his behaviours made me suspicious,but until the end I have known he is not the killer.A few sences really made me nervous, especially when Gale was chased by the killer and Dewey was stabbed.So this story again tell us the truth: 1.the killer always be this people looks unspectular.2.like the movie said:''you can not blame violent to entertainment.''there is differences between reality and truth.