Those annoying ads that you have a virus. They give you annoying stuff like, a .exe, an annoying voice that interrupts music, and those pop ups. Most people ignore them, mostly because they're scams.

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.