Others are so ludicrously funny they’ve spawned countless memes and a Twitter account called “No Context Louis Theroux”.
This film sees Theroux head off to Portland, Oregon, to investigate polyamory.
This is one of Theroux’s most heart-rending documentaries, in which he interviews dementia sufferers and their loved ones.
It’s an approach Theroux has largely maintained throughout his career; his unique brand of bumbling, placid interviewing has won him numerous Baftas and international fame.