Sonder is a noun invented by John Koenig, the person behind the Dictionary of Obscure Sorrows. It stands for the “realisation that each random passerby is living a life as vivid and complex as your own”.
We all have a voice inside of our head, that is constantly speaking, filled with mentations of different sorts.
What if, when we meet a complete stranger, it would be ok to ask the following question: In what ways are you crazy?