Lights Out (2016)

Teresa Palmer stars as Rebecca in Lights Out, a young woman who thinks the terrors of her childhood are behind her when she grows up — only to discover that they’re now haunting her little brother.

Every time they turn out the lights, they see the gruesome silhouette of a stringy-haired woman. But when they click the lights back on, she’s gone. Rebecca’s mother has a dark connection to this mysterious entity, which is intent on pursuing the whole family.

Hot tip: Watch this one with the lights ON.