You have probably encountered Jehovah's Witnesses when they knocked on your door one day, distributing their Watchtower magazine and talking about religion. If that is as much as you know about them, you might find this short video useful. Knocking may be appearing on your (USA) public television station's Independent Lens program. (Check your local listings.) You also can view the trailer in this video below. If you find it intriguing, visit the Knocking website for more information about the film and to order a DVD. Not only does the video appear to be an interesting perspective on Jehovah's Witnesses, it also illustrates people's reliance on belief in times of stress. Chances are, you may learn a thing or two about the Jehovah's Witnesses' history as well.