Rabid fans can be very, very scary.

In the trailer for the new film “The Fanatic”, John Travolta plays Moose, a fan obsessed with his favourite celebrity, Hunter Dunbar.

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After he gets cheated out of the chance to meet his hero, Moose gets help from a paparazzi friend in order to stalk Hunter.

As seen in the trailer, things soon escalate in some seriously frightening and dangerous ways.

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Directed by Limp Bizkit frontman Fred Durst, the film also stars Devon Sawa as Hunter.

“The Fanatic” is set to hit theatres and VOD on August 30.