Attack on Titan began as Hajime Isayama's manga before its anime adaptation, with Season 4, the final season produced by MAPPA, premiering in 2020 and continuing in Part 2 in 2022. Eren Yeager, the series protagonist, fights Reiner Braun in Titan form during this arc, and clips of his roars were widely shared from broadcasts and streaming rips on YouTube and social media. Fans isolated the scream as a standalone reaction sound, and editors kept reusing it for transformations, rivalries and power ups because it instantly signals Eren's anger without needing dialogue or context.