Laurel vs. Yanny is / was a debate that took the nation by storm. The clip features a noise that can either be heard as Laurel, or Yanny, or both. Originally the clip was saying Laurel as it was the pronunciation for Laurel in the dictionary, but they had to change the sound due to some hearing Yanny.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.