dictionaryofobscuresorrows.com

ZEZR TIL “Sonder” refers to the realization that each random passerby is living a life as vivid and complex as your own—populated with their own ambitions, routines, worries and inherited craziness in which you might appear as an extra sipping coffee in the background or as a lighted window at dusk.
V5GB TIL that shower-arguments have a name, Jouska. A hypothetical conversation that you compulsively play out in your head.
GnlE TIL the realization that the random people you encounter each have complex lives of their own has a name: Sonder