Fee Fi Fo Fum comes from Jack and the Beanstalk, the traditional English fairy tale in which a giant sniffs out Jack hiding in his castle. The chant has been repeated in pantomimes, children's books, cartoons and films for generations, becoming shorthand for a huge, threatening figure. Online, the deep-voiced line spread through memes, reaction videos and gaming edits, where it signals an oversized enemy or an intimidating entrance. Its simple rhythm and familiar words keep it instantly recognisable, which is why creators still reach for it.