Arigatou is one of the most widely recognised Japanese words outside Japan, thanks largely to its constant use in anime, films, and everyday Japanese speech. Even viewers with no knowledge of the language usually understand it as a warm thank you, which has helped it travel far beyond its original context. Online, short spoken versions are commonly shared as reaction sounds because they are polite, instantly readable, and easy to place at the end of a clip. Its popularity comes from that simple clarity rather than any single viral moment.