Remember when Duchess Kate Middleton accidentally twinned with Rosemary (Mia Farrow) from Rosemary's Baby and everyone made a huge hullabaloo out of it? Well, the coincidence especially felt unnerving given that she was cradling her baby, Prince Louis. Anyone familiar with the infamous movie knows that Rosemary doesn't give birth to an ordinary baby — she brings the son of the Devil into the world. In the horror movie's most memorable scene, Rosemary glances at her baby and asks a crowd of people, "What have you done to its eyes?" We don't see the baby itself, but this moment bestows the bundle of evil a stamp of approval for being one of the creepiest infants in horror movies.