It's hard to believe there have been four "Paranormal Activity" films. Even in the year 2012, where sequels and spinoffs are commonplace, it's still unlikely that the series has made it this far. What's even more unlikely? The fact that, at least up until now, the series has maintained and even raised the bar for quality with each entry. Unfortunately, with "Paranormal Activity 4" you can throw that trend out the window.