The line comes from Fist of the North Star, the 1980s anime where Kenshiro tells an opponent Omae wa mou shindeiru, meaning you are already dead. The shocked reply became a standalone reaction, often captioned Nani sore, as clips spread on YouTube and meme pages in the late 2010s. This laser version, noted as made by a Turkish creator, pairs the exchange with a sci-fi blast for extra impact. It remains popular because the setup is instantly recognisable, even to viewers who have never watched the series.