Horror films have a proud and lengthy history of using real-life gimmicks to draw in viewers, from director William Castle having actors dressed up as “nurses standing by” in case someone died of fright during showings of Macabre (1958) to the “No Late Admissions” rule that Alfred Hitchcock embraced for Psycho (1960). In the age of viral videos, this has taken on a whole new angle with pranks like “Carrie in the Coffee Shop” or “Devil Baby.”