Undertale is the 2015 indie RPG created by Toby Fox, and its sound design became instantly recognizable online alongside the game’s music, dialogue style and battle interface. Short cues like this spread through meme edits, YouTube videos and fan content because they quickly suggest Undertale without needing a full song clip. Creators still use this kind of Undertale ding for retro UI jokes, fake game menus and punchline reveals, especially when they want a brief sound that feels digital, cute and slightly dramatic.