Angry crowd recordings are a staple of stock sound libraries and have long been used in film, television and theatre to suggest a protest, a riot or a hostile audience without recording a real mob. Online, this short version spread through meme edits and reaction videos, where creators borrow the familiar booing crowd trope from sitcoms, sports broadcasts and courtroom dramas. Its brevity makes it easy to loop or repeat, and because everyone recognises the social cue of collective outrage, it still works as instant shorthand for public disapproval.