Paranormal Activity 3 Trailer

So it looks like a prequel featuring the female protagonists of the first two films when they were kids back in 1988 and their Dad was the annoying bastard that never put down a camera.

This has got a great spine-tingling scare in it but seems a little strange in that we know the two kids survive so not sure where this story is going to go. Surely we'd have heard in one of the previous films if their parents died at the hands of 'Bloody Mary' by now?

Still, I'll join the queue for this as the first two had enough scares to satisfy. What do you think?