The Jonestown Massacre is undoubtedly one of the most horrifying documented cult cases ever.
And it's the basis for Ti West's new horror The Sacrament, in which a Vice documentary crew gets exclusive access into a mysterious commune. Predictably, things do not cheerily.
Our exclusive clip shows the moment the penny starts to drop, and shocker - everyone on the comune may not necessarily be there through choice.
The Sacrament is in UK cinemas and available on VOD from today.