Realm of the Mad God is a free-to-play cooperative bullet-hell MMO first released in 2011, famous for its permanent character death: when your hero dies, it is gone for good. The Knight is one of the game's classic melee classes, and its death triggers a short, class-specific sound that longtime players recognise instantly. ROTMG fans have clipped the sound for years, dropping it into death montages, fail compilations and Twitch highlights as shorthand for a run ending badly. It endures because every veteran player has heard it at their own worst moment.