The clip exploded in May 2018 after it was shared on Reddit and then across Twitter, where listeners argued fiercely over whether they heard Yanny or Laurel. It was originally a straightforward pronunciation recording of the word Laurel, but its unusual mix of high and low frequencies meant different ears picked out different sounds. News outlets, celebrities and scientists weighed in within days, turning a simple audio illusion into a global conversation about hearing and perception. It remains a go-to example of how the same sound can be heard in completely different ways.