The line comes from Seinfeld, where the Soup Nazi, a famously strict soup vendor played by Larry Thomas, refuses to serve customers who break his ordering rules. It first appeared in the 1995 episode titled The Soup Nazi and quickly became one of the show's most quoted catchphrases. Repeated reruns, clips shared online and meme edits kept the phrase alive long after the series ended. It still works today because the refusal is instantly recognisable, even to viewers who have never watched the full episode.