The 'Impossible' meme originates from the 2019 blockbuster film Avengers: Endgame, specifically a scene where the 2014 version of Thanos realizes that his future self has been defeated and his grand plans are being systematically dismantled by the Avengers. The image captures the Mad Titan with a look of stunned, stoic disbelief, perfectly punctuated by his single-word realization. It quickly evolved into a premier reaction image across Reddit and Twitter, used to express genuine or ironic shock at unexpected outcomes, improbable coincidences, or situations that seem to defy the laws of reality. Its cultural longevity is sustained by how perfectly it encapsulates the feeling of seeing a 'sure thing' fall apart.