The line comes from Dragon Ball Z, where Vegeta uses a scouter to measure Goku's power level during their first major confrontation on Earth and reacts with disbelief at the reading. In the English dub, the delivery turned the moment into a catchphrase that spread through early YouTube remixes, forum edits and reaction videos, becoming one of anime's most recognisable memes. It endures because the number is instantly understood as shorthand for power far beyond expectation, even by viewers who have never watched the series.