What have Yanny and Laurel taught us all?
That what we hear is a mater of perspective.
What else?
That different people are predisposed to hear the higher or lower pitches of the audio and that it's age dependent.
We all know of that ringtone only kids can hear.
What about voices from the TV or Alexa device that only your kid can hear? The voice telling them terrible things that make them hollow inside? The voices you take your child to a doctor about? The voices that put them on mind control drugs?
The voices that convince them to massacre a school.