The trailer for The Purge begins positively by showing a happy family, but then cuts to graphic violence and the line "all crime is legal for one night a year". It becomes clear the film depicts a dystopian future where all crime is legal for one night annually. Later shots show a family barricading themselves inside and watching emergency broadcasts, building tension. The trailer then references the producer's horror films to signal the true genre. It ends by teasing intense scenes through quick cuts, leaving viewers wanting more answers and to see the full film.