William Shakespeare was once confronted by his girlfriend. “You pretended to be so gentle and millennial while wooing me,” she said, “and then you go and write Titus Andronicus . What’s going on in that head of yours?”

“All the world’s a stage,” replied Willy, “and we are all performing. Even I don’t know what I really am.”

We live in performative times. Peeps on Twitter are signalling virtue, peeps on Instagram are documenting what they want others to believe their life is like, and solitary loners are blogging about their solitary aloneness. All this merely makes explicit what was true for humans through the centuries: we’re putting on an act.

I thought of this recently while watching a masterpiece released in 1980: Cannibal Holocaust . This was one in a wave of Italian cannibal movies that came along in the late ’70s and early ’80s, and was directed by Ruggero Deodato, known to the French as ‘Monsieur Cannibal’. His work influenced directors like Oliver Stone, Quentin Tarantino and Eli Roth. After Cannibal Holocaust , his ninth film, was released, Sergio Leone wrote to him to say: “Dear Ruggero, what a movie! The second part is a masterpiece of cinematographic realism, but everything seems so real that I think you will get in trouble with all the world.”

He did. He was arrested because it was believed that the murders that took place in the film were real ones, and it was a snuff film, such was the realism with which it was shot. The actors had to show up in court to prove that they were alive. The film was banned in more than 50 countries, before which it grossed US$ 200 million worldwide.

In the film, a group of documentary filmmakers go off into the Amazon jungle to film cannibal tribes. They go missing. A rescue team led by an American anthropologist goes off in search of them. After numerous adventures, they discover the mutilated bodies of the filmmakers — and the footage they’d shot. They bring this back to New York.

This footage is like a film within a film within a film, because the filmmakers are like conceited millennials Instagramming everything. Whatever you see on camera is a performance, and they record everything, even sex. They are stars of their own reality show. They will use only some of what they shoot, but they shoot almost compulsively.

A few days into the trip, their guide is bitten by a snake. They record his pain. They amputate his leg to save him. They record the aftermath. They leave him to die. The camera is on all the time.

When they reach the tribes, they need spectacular footage, so they stage a massacre, forcing tribe members into a hut, setting it on fire and not letting them escape. This is for their documentary. (For a previous documentary, we are told, they had incited executions in war-torn countries so that they’d get some dramatic footage.) What happens next is not for the documentary.

They trap and gang rape a tribal girl. Every detail of this is filmed, with one man handing over the camera to another when his turn comes. Later, they come across the girl impaled on a wooden stick, and find it hard to hide their glee at getting such a great shot. They do a pop-sociological explanation for the camera by saying she was killed because she lost her virginity.

Later, the tribe comes for revenge. As they scurry through the jungle, one of the two cameramen is hit by a spear. The director shoots him so they can get footage of him being mutilated by the tribals, and tells the other guy, “Keep filming, Mark.” They do, as the tribals cut off their captive’s penis, decapitate him, hack his body into pieces and then cook and eat him.

Then they are on the run again, the director speaking to the camera as they sprint. His girlfriend, the lone woman in the group, is caught and dragged away. He decides not to try to rescue her, with the surviving cameraman reminding him of his priorities. “Think of the film! Think of the film!”

They follow, they shoot. The girl is stripped, raped, hacked, decapitated. The tribals hold her head aloft and celebrate — and then notice the filmmakers in the bushes, who keep the camera on. The last shot of the footage is the bleeding face of the director besides the fallen camera, and you have to wonder at what point he snapped out of his filming state and realised that this was real.

The film was controversial for other reasons. Although no humans were murdered, six animals were killed live on film. With each death, the director cuts off the sound to play the elegant score by Riz Ortolani, and that repeats when the human deaths are filmed. This is also commentary.

Interesting trivia: years later, Deodato played a sophisticated cannibal in one of my favourite scenes in Eli Roth’s Hostel 2 . He walks into the room, elegantly slices off a piece of thigh from a conscious captive, and then proceeds to sit at a table and eat it, as a theme from Bizet’s Carmen plays in the background.

Roth was inspired by Deodato, and I consider Hostel 1 and 2 to be great films as well. Isn’t this odd, that I find social commentary in horror films? No, it isn’t. Given what human nature is like, there is no genre more apt.

Amit Varma is a novelist. He blogs at indiauncut.com ; @amitvarma

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