Undertale was released in 2015 by indie developer Toby Fox, and its text dialogue is accompanied by short pitched blips that vary by character, from deep tones for some monsters to higher chirps for others. That system became one of the game's most recognisable audio signatures. As fans recreated scenes in animations, comics with added audio, and meme edits, the neutral generic version spread as a reusable effect for any retro-style conversation, long after players had finished the original story and its alternate routes.