Did Grover drop an F-bomb on Sesame Street? Do the names Yanny and Laurel make you want to fight? You know what your ears tell you; you heard it yourself! But why do so many people disagree? How can people hear radically different things in the same sound? Whos right? Can even a professional linguist say for sure? Pit your ears against your friends and neighbours and lets settle this once and for all. Using acoustic trickery, Rebekka Puderbaugh (University of Edinburgh) makes you doubt reality and distrust everything (you think) you hear.