The document discusses the British Board of Film Classification (BBFC) and its rating system for films, DVDs, and video games, outlining classifications from Universal to Restricted 18. It reviews specific thriller films, such as 'Gone Girl' (rated 18) and 'Shutter Island' (rated 15), explaining their content and the reasons for their ratings. The author decides on a 12A rating for their thriller film opening, as it contains no violence or disturbing scenes, with only mild language.