In 2015, Korean YouTube channel Pinkfong released the original “Baby Shark Dance,” a simple and sweet little ditty about a shark family. The video showcased little kids singing and dancing against a backdrop of under-the-sea animation and featured plenty of “doo-doo-doos.”

Despite the simplicity of the lyrics, the song was catchy as heck. While Pinkfong was already popular among YouTube users for its educational content for those 5 and under, “Baby Shark Dance” quickly became its most popular video. It hit YouTube’s list of the top 40 most-viewed videos of all time just last year and has millions of views, as seen below: