Mawaru Penguindrum is a 2011 anime series where three mysterious penguins accompany the Takakura siblings and communicate only with short kyu sounds. The birds quickly became the show's most recognisable mascots, and their calls were clipped and shared as ringtones and short sounds on anime forums and soundboards. The Penguindrum penguin ringtone survived beyond the series because the sound is distinctive without needing any context or dialogue, making it easy to recognise, loop and reuse as a cute alert or meme reaction long after the episode aired.