The opening sequence of The Purge introduces the dark tone of the film through three CCTV-style footage clips showing increasingly violent crimes. The first clip shows a gunshot with no context. The second shows a gang shooting at each other with a "PURGE FEED" watermark and future date, unsettling viewers. The third depicts a wounded woman, heightening tension but still providing no clear context about the film's title or plot. Overall, the sequence uses disturbing realistically-styled footage to set an ominous tone and intrigue viewers without fully revealing the film's premise.