"Go ahead, make my day" is a catchphrase from the 1983 film Sudden Impact, spoken by the character Harry Callahan, played by Clint Eastwood. The iconic line was written by John Milius, whose writing contributions to the film were uncredited, but has also been attributed to Charles B. Pierce, who wrote the film's story, and to Joseph Stinson, who wrote the screenplay. In 2005, it was chosen as No. 6 on the American Film Institute list AFI's 100 Years...100 Movie Quotes.

Sudden Impact is a 1983 American neo-noir action thriller film, the fourth in the Dirty Harry series, directed, produced by and starring Clint Eastwood and co-starring Sondra Locke. The film tells the story of a gang rape victim (Locke) who decides to seek revenge on her rapists 10 years after the attack by killing them one by one. Inspector Callahan (Eastwood), famous for his unconventional and often brutal crime-fighting tactics, is tasked with tracking down the serial killer.