This sound is tied to Undertale, the 2015 indie RPG created by Toby Fox, and specifically to Chara, one of the game's most unsettling characters. Short Chara jumpscare clips spread through fan videos, reaction edits and gaming meme compilations, where creators used the sound to mimic a sudden horror reveal. It remains popular because Undertale has a large online fandom and Chara is instantly recognizable to players, so even a very brief sting can signal a dark twist or joke without needing much setup.