The sound comes from Nintendo's The Legend of Zelda: Majora's Mask, first released in 2000 for Nintendo 64, where a giant moon threatens to crash into Termina over a repeating three-day cycle. Clips of its ominous music and sound effects spread through YouTube edits, TikTok videos and soundboards as shorthand for approaching disaster. It remains popular because the moon image is instantly recognisable and the toll instantly signals that time is almost up.