Most of us know Jehovah’s Witnesses as door-to-door non-secular salesmen, but, as PBS’s documentary Knocking testifies, the real Witnesses are a breath of fresh air: a depoliticized group of moral conservatives who believe in persuasion over imposition. Tracking two families through a few days of the 1.3 billion hours Witnesses spend in traveling ministry every year, the film allows audiences some downtime with this highly misunderstood group of believers — you know, without actually having to let them into your house.

Fri., Sept. 28, 8 p.m., 2007