Memento is the 2000 Christopher Nolan thriller famous for telling its story in reverse, which made it a longtime shorthand online for confusing plots and twist endings. Reaction clips titled after the film are typically fan-made recordings rather than audio taken from the movie itself, created to bottle that stunned feeling viewers get from its finale. They circulate on soundboards and in meme edits wherever creators need a quick, relatable gasp of disbelief, especially over videos about complicated stories, sudden suspense moments and movies that demand a second watch.