People watch horror films for the thrill and to experience fear through the fight or flight response. Different age groups enjoy horror for different reasons, with those aged 15-19 generally finding them the scariest and most relatable. Audiences can watch horror films in theaters for the atmosphere, or at home through DVDs, streaming, and downloads. Ticket sales for the film "The Woman in Black" made $20 million in its opening weekend in the US, demonstrating the large size and demand of the horror film industry.