Those other awesome souls you encounter when doing circles in the snow in the barren parking lot next to the old K-Mart Garden Center. They will politely wait safely along the outskirts while you take a turn, expecting the favor to be returned. All of this is communicated intuitively. When it is their turn, they will certainly try to show off and one-up you, and it continues on like this until all of the fresh powder is ruined.

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.