Hereditary (2018)

Ari Aster's debut feature was called "the most terrifying film since The Exorcist" by Time magazine and holds an 89% rating on Rotten Tomatoes. Made for $10 million and grossing over $80 million worldwide, it works by grounding its occult horror in authentic grief — the family's unravelling feels devastatingly real before the supernatural elements fully emerge. Toni Collette's performance, controversially overlooked by the Academy, is widely regarded as one of the greatest in horror history.