This sound comes from Undertale, the 2015 indie role-playing game created by Toby Fox. The game's interface, dialogue style and character writing made its text blips highly recognizable online. Over time, creators began using the Undertale text sound in memes, parody conversations and fan edits to imitate the game's dialogue boxes. It remains popular because a tiny clip instantly signals Undertale's retro style and emotional tone, whether the edit is sincere, comedic or slightly awkward on purpose.