An early comic strip by George Herriman. The titular "family upstairs" is [[TheGhost never seen]]; the audience only sees the (usually angry) reactions of the inhabitants of the apartment below them to the annoying noises, escaped pets, and so on. It is chiefly notable for a tiny companion strip that ran alongside it that featured [[ComicStrip/KrazyKat a couple of characters that later became much more well-known]].
* AnimalJingoism: One series of strips, narrated by Ignatz, goes into the history of mouse/kat rivalry--it seems that the Golden Age of Mice came to an abrupt halt as soon as a kat arrived on shore and started eating all the citizens. Therefore, "Ignatz the Avenger", as he styles himself, holds that Krazy deserves every brick he gets.
* AnthropomorphicShift: As the Dingbat's rather ordinary-looking pet "kat" gradually evolved into [[ComicStrip/KrazyKat Krazy]], it began to walk on its hind legs.
* FunnyBackgroundEvent: Plenty--most famously, the one that became the entire premise of ''ComicStrip/KrazyKat''.
* BreakoutCharacter: Two--[[ComicStrip/KrazyKat Krazy and Ignatz]].
* TheGhost: The entire "family upstairs" is made up of these. Despite their lack of presence, they cause a lot of trouble.
* TheVoice: In at least one strip, we hear the Family Upstairs cheering uproariously because the Dingbats came home from their vacation.