18. The Rocky Horror Picture Show (1975 – Jim Sharman)
Unlike any of the other movies on this list, this 70s adaptation of Richard O’Brien’s infamous musical gained cult status through passionate fan participation. This horror-comedy with obvious sexual undertones aims to shock, amuse, and liberate the audience. The film’s gory plot is softened by the parodic nature of the film, pantomime, and jokes. Audiences at screenings are encouraged to join in the fun and participate in various rituals and in-jokes! The Rocky Horror Picture Show has sure provided a variety of classic Halloween costumes over the past years.