Horror movies have been a staple of popular culture, providing audiences with a thrilling and often terrifying experience. Bhool Bhulaiyaa, directed by Vikram Bhatt, is a Bollywood horror film that tells the story of a pregnant woman, Avni (Vidya Balan), who is haunted by the spirit of a woman, Manjulika (Pooja Bhatt), trapped in an ancient mansion. The film's success can be attributed to its masterful use of psychological horror elements, which create a sense of fear and suspense in the audience.