Originating in the opening narration of Avatar: The Last Airbender, which premiered on Nickelodeon in 2005, the line is spoken by Katara as she recounts how the Fire Nation broke the balance between the four nations. The phrase became a widely quoted meme years later as clips and edits reused the dramatic delivery to introduce sudden disasters, betrayals, and plot twists. Its popularity endures because the reference is instantly recognisable to animation fans and works as shorthand for a world turning upside down.