Furby was released in 1998 as an interactive electronic toy that spoke its own invented language, Furbish, and gradually learned English phrases. Its blinking eyes, moving beak and high-pitched chirps made it a huge playground craze at the turn of the millennium, and it has remained a pop-culture reference ever since. Short recordings of its singing and peeping now circulate online as nostalgic meme sounds, used to suggest something cute, creepy or unexpectedly alive.