The line comes from Scarface, the 1983 crime film directed by Brian De Palma, in which Al Pacino plays Cuban drug lord Tony Montana. Spoken during the film's violent final shootout, it has become one of the most quoted movie lines of all time, sampled in music and reused in countless edits, trailers and parodies. Decades later it still works because the delivery is instantly recognisable even without the film, turning a simple greeting into a threat and a promise of chaos.