Louis Theroux is back with a documentary titled Drinking to Oblivion, which reveals the terrifying reality of alcoholism - but he had an even more hard-hitting subject matter planned before settling on addiction.
Everyone's favourite documentarian told NME that he had looked into investigating the "growing world of ISIS sympathisers" - unsurprisingly, though, it was rather difficult to pull off.
He definitely isn't one to shy away from controversy, having already delved into the world of the Westboro Baptist Church, neo-Nazis and convicted paedophiles.
"It didn't pan out," he explained. "People who are sympathetic to ISIS don't trust the media in general and the BBC specifically, so it's very hard to build trust.
"It's also very hard to get into that world in an intimate way."
And the roadblocks didn't stop there. Agreeing with terrorism on camera doesn't sound like a very smart decision - something that backfired on Theroux's willing participants.
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"There are various laws to do with not glorifying terrorism, so they fear that if they say the wrong thing they'll be arrested," he went on.
"In fact, a couple were arrested during the period we were talking to them."
However, not much deters Theroux from exploring interesting and odd topics in his documentaries.
Recently he revealed that he was being surveilled and filmed by The Church of Scientology while shooting scenes for his documentary entitled My Scientology Movie.
Louis Theroux: Drinking to Oblivion will air on BBC Two at 9pm on April 24
