This sound is associated with Attack on Titan, the anime adaptation of Hajime Isayama's manga that began airing in 2013. Transformation audio from the series became popular in fan edits, AMVs and short-form videos because it instantly signals a major shift in power or identity. Online, creators use it well beyond the show itself, often for joke glow-ups, villain reveals and exaggerated comeback moments. It remains popular because even a very short clip carries the recognizable tension and scale people associate with Titan scenes.