The blast comes from Inception, Christopher Nolan's 2010 science-fiction film, where Hans Zimmer's score used low brass and slowed-down sounds to create its towering horn effect. After the film's release, the sound was copied so often in movie trailers that it became shorthand for epic scale and impending drama. Online, editors shortened it to a few seconds and reused it in memes, reaction videos and gaming clips, where its instant familiarity does the work of a full build-up.