Obsession, the new Blumhouse horror film by writer and director Curry Barker, is streaming on Apple TV and Amazon Prime. It is, thanks to the power of social media, word-of-mouth, and meme culture, a viral sensation, earning $377 million at the worldwide box office on a $750,000 budget. Thanks to the facial expressiveness of actress Inde Navarrette—who steals every scene she's in as Nikki—we have enough reaction GIFs to last us for years. The premise is simple and time-tested.