6) Hereditary

Ari Aster’s 2018 supernatural thriller ‘Hereditary’ tells the story of the Graham family, who unearth chilling and cryptic secrets about their ancestry following the death of Annie Graham's mother Ellen.

Annie - played by Toni Collette (pictured) - begins to unravel the secrets of her secretive parent's life with chilling consequences.

Viewers had an average heart rate of 82 beats per minute – with the highest spike reaching 104.