Yobikomi Kun is a Japanese electronic sales promotion device best known for the catchy melody it plays in supermarkets and retail spaces. The tune became familiar far beyond stores because shoppers recorded it and shared it online, where it spread through meme edits, ambience videos and parody clips. It is still widely used because a few seconds of the melody immediately signal shopping culture, busy aisles and discount energy. Online, it often fills a similar role to a ding sound effect when creators want an instant audio cue.