Deltarune is an indie role-playing game by Toby Fox, first released in 2018, in which Dark Fountains open portals to alternate Dark Worlds. Fountain imagery quickly became shorthand among fans for a story changing, a hidden world appearing, or a twist taking hold. Short clips built around that idea spread through fan edits, memes, and short-form videos, where the reference works even without gameplay footage. It remains popular because the image is instantly recognisable to fans, flexible enough for jokes and dramatic edits, and easy to drop into almost any reveal.