Online, What in the World has become a handy shorthand for disbelief, shared in reaction videos, memes and short edits whenever something does not quite make sense. Its appeal lies in its simplicity: the phrase is instantly understood, works across many contexts and does not need setup or explanation. Creators use it to punctuate surprising reveals, odd moments and unexpected twists, often letting the sound carry the joke on its own. Because it is short and recognisable, it continues to circulate as a reliable reaction clip.