Paranormal Activity 2 - Trailer

I thought the original was pretty creepy and actually kinda cool for what it was. Unfortunately, I'm not sure what to make of this one. Like the Blair Witch Project, Paranormal Activity is one of those films that should be left alone... The first, like TBWP, took everyone by surprise and was a total success, but does it have enough substance to carry a sequel. Will it circle the drain like The Blair Witch sequel, or will it become the next big halloween franchise like Saw... We'll see this October!