The Purge is a fictional horror film series that explores a dystopian future where all crime, including murder, is legal for one night each year. The phrase 'The Purge Has Commenced' signals the start of this chaotic event, where societal norms are thrown out the window and individuals are unleashed to commit their darkest impulses. This line has become iconic not just within the context of the movie but also permeated pop culture as a catchphrase used to signify the outbreak of wild behavior or an impending chaotic situation.