Itachi Uchiha is a central character in Naruto, the long-running anime and manga series, and his Mangekyou Sharingan is the advanced form of his clan's eye technique, linked to powerful genjutsu and the Amaterasu flames. Clips of its activation became popular in anime edits, AMVs and short-form videos, where the sound marks a turning point or a display of overwhelming power. It remains widely used because Itachi is one of the series' most iconic characters, and the Naruto Sad Song is often paired with it in emotional tributes.