Aelian, Varia Historia:

4.
When Socrates saw Alcibiades made arrogant by his wealth and proud of his property, in particular of his large estates, he took him to a spot in the city where a board had been set up showing a map of the earth.

He asked him to look for Attica on it. When Alcibiades found it, he asked him lo locate his own properties. In response to the comment “They are not marked anywhere” he replied “Are you then proud of properties which are not a fraction of the earth [μέγα φρονεῖς, οἵπερ οὐδὲν μέρος τῆς γῆς εἰσιν;]?”

(III 28)

Ich kenne das ähnlich auch als Witz aus dem III. Reich:

Der Vater zeigt seinem Sohn auf dem Globus: die Sowjetunion, das Britische Imperium, die USA.
"Und wo ist das Großdeutsche Reich?" fragt der Junge.
"Hier", antwortet der Vater, "dieser kleine Fleck."
"Oh. Du, Papa, weiß der Führer das?"

Nun, anscheinend wußte er es nicht.