Five all-American college students (including Chris Hemsworth) head off for a weekend getaway at an isolated cabin.

However, their hijinks quickly turn to terror when they unwittingly unleash sinister forces.

So far, so familiar, but writer-directors Joss Whedon and Drew Goddard aren’t churning out just another haunted-house or slasher movie.

Instead, they’ve come up with a mischievous, mind-bending chiller that gleefully turns the horror genre inside out, upside down and back to front.

The longer it goes on, the more the film confounds expectations – but it may all have something to do with a group of scientists in white coats.

A giddily funny, gulpingly scary, enormously entertaining thrill ride.