The brilliant words of Ethan Nestor aka Crankgameplays. Using this during Unus Annus to try to encourage Markiplier to go faster on the bike. But led to Mark punching his wall, but don't tell amy!

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.