VIDEO: 'Paranormal Activity 3' trailer

paranormal_activity_three.jpgIt's become a Halloween tradition not seen since, well, " Halloween."

The " Paranormal Activity" series is back for its third try at scaring the pants off of viewers. And now there's a preview out to get fans in the mood.

This time around, the film is a prequel that examines the origins of the ghosts and spirits that torment sisters Kristi ( Sprague Grayden) and Katie ( Katie Featherston). The film takes place in 1988 when the two are young children.

The first two from the series have grossed a combined $370 million on a collective budget of only $3 million. So it's no wonder producers were eager to make a third.

The film is set for release Oct. 21. For those who can't wait until then, Paramount is running a Twitter-based contest to determine which city will see the film even sooner.

Here's the preview...

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Photo/Video credit: Paramount