Horror fans these days are getting a lot more desensitised than back in the day, can you imagine the reaction if audiences from the '60s and '70s watched Saw or Insidious?
As such, the trailers need to step up the horror to tempt these hardy slasher buffs, and here are the scariest trailers that you can imagine.
10. Saw (2004)
The first Saw movie was a masterpiece with a fresh new take on the horror genre, before the sequels got obsessed with beating their previous 'gore quota'.
This trailer provides us with enough storyline to entice, while filling us with the disturbing dread that the film delivered.
9. The Blair Witch Project (1999)
The trailer for the viral horror phenomenon doesn't give away much at all, although you could say the same for the actual film, but the lack of actually seeing something makes things a hundred times more scary (again, same for the film).
8. Mama (2013)
Starring Jessica Chastain, this under-the-radar horror featured feral children who are taken in by their uncle to give them a normal life.
The children are pretty disturbing themselves, but it takes it to the new level their Mama's ghost shows up, complete with crab walking on the ceiling jump scares.
7. Dead Silence (2007)
Ventriloquists dummies are among the scariest things created by man, so they were perfect for the horror flick about a ventriloquist who was suspected of murder and had her tongue cut out.
Some footage from the film interspersed with creepy ventriloquists dummies is a simple, yet chilling trailer.
6. The Devil Inside (2012)
A new exorcism film for the millennial age, full of demonically possessed people doing all manner of crazy and disturbing things, which is perfect for quick trailer cuts and jump scares.
It is the creepiest way you have heard anyone say "connect the cuts" - if you have ever heard anyone say that before.
5. V/H/S (2012)
An anthology of six different disturbing 'found footage' films, which provide plenty of variety when sticking blood-soaked jumps and peril into the trailer.
It'd be a heck of a lot scarier if they hadn't broken up all of the jumpy horror moments with those Film Festival boasts and reviewer quotes.
4. The Strangers” (2008)
A home invasion story 'based on true events' with the villains' unexplained motives for generally making Liv Tyler's live a misery is nightmare fuel enough.
But add a squeaky swing, a record player (as a horror rule, record players always play creepy music) and three villains in really creepy masks and this trailer is two minutes of terror.
3. Evil Dead” (2013)
For the 2013 remake of the classic 1981 zombie horror film, the makers had to up the ante in every way possible to make it more terrifying and disturbing.
In the trailer we're treated to toe-curling self-mutilation, people getting vomited in the face and a whole bunch of more freaky, unsettling things.
2. The Conjuring (2013)
Creepy old house? Check. Giggling children? Check. Unexplained goings on? Check. There's no wonder The Conjuring was one of the scariest films of the last decade.
In the trailer, just as you think something terrifying is about to happen, it pulls you back, then brings it in when you've relaxed. That clap, that terrifying clap.
1. Goodnight Mommy (2015)
When the trailer for this Austrian film was released earlier this year, the internet proclaimed it was the scariest trailer OF ALL TIME!
A creepy, post-surgery bandaged up woman who doesn't appear to be the mother of the twin boys who seems to eat cockroaches - tension, weirdness and an extremely weird woman - the internet might be right on the money.