What low-budget horror films can teach documentary makers

Most Octobers I end up running a horror double bill in some small room with a humming projector and a popcorn machine nobody quite trusts. And most Octobers at least one documentary friend gives me the look, as if I had invited them to a monster truck rally. They make films about housing and grief. Teenagers screaming in the woods are not their idea of homework.

They should come anyway. Cheap horror and independent documentary grew up in the same neighbourhood: tiny crews, real locations, no money for spectacle, and an audience that has to believe what it sees or the whole thing falls apart. The best horror films made on almost nothing solved problems documentary makers face every week, and they solved them with sound, patience and a good eye for a building. Here is what I would want any documentary maker to carry home from a Halloween double bill.

The most famous film about a documentary shoot

Start with the obvious one. Daniel Myrick and Eduardo Sánchez's The Blair Witch Project (1999) is, on paper, a film about three students making a documentary. They interview locals about a legend, head into the woods with a film camera and a video camera, and things go very badly. The whole film is presented as the footage they left behind, and it was made for a tiny budget.

What makes it useful to you is how thoroughly it borrows your grammar. The handheld frame, the interviews in a small town, the arguments about whether to keep rolling: these were the signals audiences had learned to read as real, and the film used every one of them. Its marketing leaned on the same trick, treating the story as if the footage had actually been found.

I take two lessons from that. First, the look of authenticity is cheap to manufacture, so it proves nothing on its own. Your credibility has to come from what you can show and stand behind, which is the heart of Claire Archambault's guide to watching documentaries critically. Second, audiences lean in when they sense something unpolished. You don't need to fake that. You only need to stop sanding it off in the edit.

Sound does the heavy lifting

Watch the night scenes in Blair Witch again with your eyes half shut. Most of the terror arrives as sound: something moving outside the tent, sticks cracking, noises that have no business in a forest at that hour. The picture is often close to black. Your ears do the work and your imagination supplies something worse than any effects budget could buy.

Documentary makers tend to treat sound as the thing that must not go wrong, rather than the thing that can carry a scene. Fair enough, since clean dialogue is the job. Horror teaches the second job, which is atmosphere. The fridge hum in a widower's kitchen. Wind worrying at a trailer door. A factory floor after the shift has gone home. These sounds tell an audience how a place feels before anyone says a word.

So record the place, not only the people. Ask for two minutes of silence in every room you shoot, then record it again after dark if the room changes at night. Walk the outside with a microphone and no camera. Keep the creaking floorboard your interviewee kept apologizing for. You are not inventing anything, you are keeping what was there, and in the edit those minutes will be worth more than another hour of cutaways.

There is a line, and it matters. A horror film can add a growl in the dark. A documentary cannot add a sound that suggests something happened when it didn't. Use atmosphere to place the viewer, never to mislead them.

What you keep out of frame

The witch is never shown. Not once. People walked out of that film arguing about what they had seen, and the honest answer was trees, a tent, a ruined house and a man standing in a corner. Suggestion beats any monster suit, because each viewer builds the thing they fear most.

Documentary has an ethical version of the same tool, and it is often the kinder one. You don't need to show the body, the wound or the wreck. An empty bedroom, a cold dinner, shoes still lined up by the door: these tell an audience what happened while leaving the people involved their dignity. Some of the most painful documentary scenes I know take place entirely in a hallway.

Restraint also protects you from the worst habit of issue films, which is showing everything because you can. Once the audience is with you, an image held three seconds too long tips into exploitation. Horror directors know to the frame when to cut away. So should you.

One farmhouse, one cabin, one cube

George A. Romero's Night of the Living Dead (1968) was made independently by a small Pittsburgh outfit better known for commercials, and most of it plays inside a single farmhouse. Sam Raimi's The Evil Dead (1981) puts five friends in a cabin in the woods and barely lets them leave. Vincenzo Natali's Cube (1997), a Canadian film, goes further still. Its strangers move through room after identical room, each one different only in the colour of its light, and the film keeps a whole maze alive on what is largely one set.

Nobody is asking you to shoot a whole documentary in one room. The point is that a place you know deeply becomes a character, while a place you only visit stays wallpaper. Horror set in one house learns every inch of it: which window faces the road, which stair complains, what the cellar does to a voice. That knowledge reaches the screen as tension.

If your film has a central place (a family restaurant, a curling rink, a riverbank camp) spend time there without the camera first. Go at dawn and at closing time. Notice where the light falls in February and where it falls in June. Learn which door everyone actually uses. A small crew with few shooting days gets far more from one place it understands than from five it barely met. Fewer locations also means fewer permissions and fewer hours lost loading the van, a point I argued at length in my piece on micro-budget features that made it.

Black and white, and other limits worth keeping

Night of the Living Dead is in black and white, at a time when colour was becoming the norm for feature films. It also looks a lot like the television news its trapped characters keep anxiously tuning in to, and that resemblance has aged into one of its great strengths. The closing credits roll over grainy stills that look like press photographs, and they land harder than any effect.

For documentary makers, the limit you resent is often the one that gives your film its face. One fixed lens. A single camera. A subject who will only speak with the lights off. Archive that survives only as smeary videotape. Each can become a style if you commit to it instead of apologizing for it in every frame.

Romero's film carries a warning from the paperwork side too. It famously slipped into the public domain in the United States because its release prints went out without a proper copyright notice. That helped it spread everywhere and did its makers no favours. Read your contracts and your delivery list before the premiere glow sets in.

The monster is usually about something else

John Fawcett's Ginger Snaps (2000), written by Karen Walton, is a Canadian werewolf film about two death-obsessed teenage sisters in a dull suburb. One of them is bitten on the same night her first period arrives. From there the film is as much about a body changing past anyone's control, and a sisterhood straining under it, as it is about fur and teeth. The genre is the delivery van. The cargo is adolescence.

Documentary makers know this move from the other end. You think your film is about a dog show, and it turns out to be about a marriage. You set out to film a building's last winter, and it becomes a film about who gets to stay in a city. Good horror directors know what their monster stands for, at least privately, and that clarity shapes every choice. Ask yourself early, and again in the edit: what is my film's werewolf?

Night of the Living Dead teaches the same lesson in a harder key. Its hero, played by Duane Jones, is a Black man holding a house together against the dead and against the panic of the white strangers sheltering with him. Audiences have read the film through the America of its year ever since. Whatever the makers intended, that meaning arrived and stayed. Your documentary will also mean things you didn't plan, so show the cut to people unlike you before you lock it.

Make the short first

Before The Evil Dead, Raimi and his friends made a short called Within the Woods and used it to show would-be backers what they could do. It is the oldest trick in independent film and still one of the best. A small finished thing persuades more people than a big unfinished promise.

Documentary has its own version in the sample reel, and plenty of filmmakers treat it as a chore to get through before the real work. Treat it the way a horror director would, as proof of tone. If a funder or a festival programmer can feel the atmosphere of your film in four minutes, everything that follows gets easier.

Five films at a glance

A night-shoot checklist for documentary crews

• Record two minutes of room tone in every space, and again after dark if the place changes at night.
• Walk the exterior with a microphone and no camera, and keep what you hear.
• For each location, note one thing you could show instead of the hardest thing to show.
• List the limits you can't fix, then write one sentence on how each could become a style.
• Cut a four-minute sample before you apply for anything.
• Watch your rough cut once with the picture off. If the sound alone doesn't hold you, the film won't either.
• Screen it for someone unlike you before picture lock.

You can find more cheap and stubborn filmmaking in our independent film programme. But before Halloween, try one small experiment. Put on any of these five, drape a tea towel over the screen for the first twenty minutes, and just listen. Then go back to your own footage, cover the monitor, and listen to that.