Sosuke Aizen is the composed, manipulative antagonist at the centre of Bleach, and his restrained delivery is a large part of why short lines from him circulate so widely as reaction sounds. This brief sigh has become a handy shorthand in anime edits, gaming clips and short-form videos for boredom, disappointment and quiet superiority, because it needs no translation or context to be understood. Its length also helps: at under two seconds, it can sit neatly between dialogue, gameplay or a caption without slowing the pace of a fast edit.