The line comes from the 1975 comedy film Monty Python and the Holy Grail, where the Knights Who Say Ni confront King Arthur in one of the movie's most quoted scenes. Over time, the quote spread far beyond the film through fan references, internet jokes and remix culture. It still shows up in meme edits and reaction clips because the delivery is instantly recognizable, brief and bizarre enough to work as a standalone punchline even outside the original scene.