FaceTime is Apple's built-in video calling service for iPhone, iPad and Mac, and its join-call chime is the sound users hear when another person enters an ongoing call. As screen recordings, reaction videos and meme edits spread across TikTok, YouTube and Instagram, creators began lifting the chime out of its original context and using it as a quick audio cue for any video call, meeting or surprise appearance. It remains popular because it is instantly recognisable to Apple users, short enough to fit a single cut, and carries a friendly, everyday association with friends and family calling.