A film which has one of the most realistic portrayals of a nuclear catastrophe aired on the BBC for just the fourth time ever last night.
With viewers calling it 'one of most depressing and scary films ever', you can probably hazard a guess why it's not shown much on the telly.
The 1984 movie is set in the city of Sheffield, UK, and shows the consequences of nuclear conflict between the US and the Soviet Union during the Cold War.
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Titled Threads, you can take a look at what to expect below:
Directed by Mick Jackson, Threads is the story of two working-class families - the Kemps and the Becketts - who are living through the horrific aftermath of war.
The people of Sheffield are hit with widespread fires in the city, radiation sickness and starvation as it becomes the new normal.
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Main character, Ruth Beckett, is portrayed by Karen Meagher, and her boyfriend, Jimmy Kemp, is played by Reece Dinsdale.
Ruth and Jimmy decide to get married after Ruth unexpectedly gets pregnant but the pair are separated as the fallout spreads.
Meanwhile, David Brierly and Rita May take on the role of Jimmy's parents.
After giving Threads a go last night, viewers have admitted that they did not take the warnings seriously.
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Taking to X, one viewer wrote: "40 years and still one of the most horrifying things I have ever seen #Threads."
"Just watched Threads on BBC4, I have never seen a film that is so depressing and bleak in my life," a second commented.
"Actually wasn’t prepared for how bleak it was."
A third added: "I regret watching Threads for the first time before bed."
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While another agreed: "Should not have watched #Threads before bed.
"Everyone always comments on how unremittingly f**king bleak it is but that really doesn't prepare you for how unremittingly f**king bleak it is."
"Watching Threads on BBC Four for its 40th anniversary screening. Bloody hell," a fifth penned.
Now, if you're someone that needs the Rotten Tomatoes seal of approval, critics have awarded Threads with a 100 percent score, while the general audience have given it a solid 92 percent.
Threads is available to watch on BBC iPlayer for another 29 days, at the time of writing.
Anish Vij