An unofficial Holiday in the Kingdom of Trimaris, SCA, on or about November Third where the participants change their social media profile pictures to that of St. Danial von Hessen. The goal is to raise the ire of the Hessen so that we may all be warmed by his wrath.

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.