A common and very annoying gaming phenomena in First Person Shooters, It is when ever you have one remaining bullet and no remaining ammo in your clip. It is a reference to Barney Fife who is only allowed a single bullet in his gun.

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.