So, we're going to kill her and her friends, and we're going to keep moving on. >> You know the movie Scream? Two 16-year-olds in Idaho loved it so much they turned it into reality. Brian and Tori weren't just horror fans. They were obsessed they even made a death list of classmates, plotting who they'd kill, and filmed themselves talking about it like stars in their own twisted movie. >> We're going to make history. >> Their plan finally focused on a friend, Cassie Joe, who was housesitting one weekend. They hung out with her, acted normal, even toured the house. But while she wasn't looking, they unlocked the back door. Later that night, in mass they made to look like Scream. >> And we're obviously going to hell if it's real, but you know, who gives a [ __ ] >> They snuck back in, cut the power, and hid in the basement. Cassie and her boyfriend noticed strange things. But when her boyfriend had to leave, Cassie was all alone. That's when Brian and Tori attacked, stabbing her more than 30 times. They ran off, turned on their camera, and bragged. Uh, you weren't quick enough. >> You weren't quick enough and you weren't smart enough. >> Those tapes they recorded to feel like horror legends became the evidence that got them caught. >> I stabbed her in the throat and I saw her lifeless body. >> Both are now serving life in prison.