While some people claim to hear the word "Laurel" in the clip, others say they hear "Yanny."
The clip has been shared thousands of times, and people around the world – including celebrities Chrissy Teigen, Mindy Kaling and, of course, Yanni – have weighed in on what they hear.
The internet debate is similar to other sensations over the last few years, such as the dress, these shoes or this jacket.
So, is it "Yanny" or "Laurel"? Weigh in with our poll.