The Sun Vanished is a pioneering Twitter-based Alternate Reality Game (ARG) that launched in 2018, documenting a surreal event where the sun suddenly disappears from the sky. The narrative is told through short, cryptic video clips and photographs showing a world plunged into eternal darkness, haunted by mysterious entities. While it began as a masterclass in internet horror storytelling, it quickly transitioned into meme culture as users repurposed the bleak, atmospheric imagery to describe everything from staying up too late to feelings of total confusion. Today, the meme is widely used to evoke a sense of uncanny isolation or to mock situations where something essential suddenly goes missing.