Hollows are a central enemy in Bleach, the manga created by Tite Kubo and its long running anime adaptation. In the story they are corrupted spirits that hide behind white masks and hunt souls, and their cries were designed to sound inhuman and unsettling. As Bleach clips circulated on video and soundboard platforms, short Hollow roars were cut out and reused outside the episodes. The sound remains popular because it signals a supernatural threat immediately, even for viewers who have never watched the series in full.