Uboa is a mysterious and terrifying entity from the 2004 surreal adventure game Yume Nikki. Found in the dream world of the protagonist Madotsuki, Uboa appears in Poniko’s house with a 1-in-64 chance when the lights are toggled. Its sudden, distorted appearance and haunting scream turned it into one of the most famous early internet 'creepypastas' and indie game secrets. In meme culture, Uboa is used to represent sudden shocks, intense existential horror, or a chaotic reaction to something unexpected, often paired with surreal or glitchy aesthetics to emphasize its unsettling nature.