The line comes from Dirty Harry, the 1971 crime film directed by Don Siegel starring Clint Eastwood as Inspector Harry Callahan. In the opening scenes Callahan corners a bank robber and delivers the .44 Magnum monologue, ending with the famous question. The American Film Institute ranked it among the greatest movie quotes of all time, and it has been quoted, parodied and sampled for decades. Its clipped rhythm makes it perfect for memes about risk, bluffing and last-second decisions, which keeps it circulating far beyond the original film.