This clip comes from the viral Lego City rescue commercial meme built around the line about a man falling into the river. Online edits often isolate the shouted 'Hey!' because it is the fastest, most recognizable part of the ad. The meme spread widely through short-form remixes, YouTube reposts, and reaction edits, where the shout became a cue for sudden danger, interruption, or exaggerated urgency. It still works because even people who do not know the full ad usually recognize the delivery.