In colder parts of the world, it’s common to see uses of electric oil pan heaters to assist with engine start-ups and ignition. However when someone forgets to un-plug their vehicle’s oil pan heater from
the extension cord, the result is a dangling cord behind a truck or car.

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.