Jack the Ripper was the unidentified serial killer active in London's Whitechapel district in 1888, and the name has since become shorthand in fiction for a mysterious, knife-wielding murderer. Anime, games and films reuse the figure constantly, often as a hidden assassin or dramatic character reveal, which is how the name entered meme sound culture. Online, this short clip is shared as a reaction and editing sound rather than a historical reference, dropped in when someone is cast as the villain, the suspect, or the person behind a chaotic twist.