In most cases this means interviewing people with extreme beliefs of some kind, or just generally belonging to subcultures not known to exist by most or just frowned upon. It was first shown in the UK on BBC2.
In first episode of Theroux’s Weird Weekends, in Dallas, Louis meets TV evangelists Marcus and Joni Lamb, and joins a group of hardline Christians called “The Family” as they visit the Deep Ellum entertainment district.