Roman Polanski’s Rosemary’s Baby remains one of the best horror movies ever made, 44 years after its release, and its dream sequence of a centerpiece is one of the many reasons why.

Whether it’s a vivid nightmare or a real-life occurrence is open to interpretation. No matter how you see it, though, the scene in which Lucifer himself impregnates a helpless and naked Rosemary Woodhouse (Mia Farrow) is one of the genre’s moments of directorial wizardry.

In a dark bedroom, surrounded by disrobed elderly Satanists, Rosemary’s body gets clawed up and probed as she cries out, “This is no dream—this is really happening!” The scratch marks she discovers on her back after waking up certainly point to the same explanation.