Well, everybody’s talking about the “Grexit,” i.e., Greece’s exit from the Eurozone, which looms egregiously as I write. But how many of them know that “grex” is Latin for flock, and forms the basis for the word egregious (lit. standing out above or from the flock), not to mention congregate, aggregate, and segregate? Or that in English, it actually refers to a clump of slime mold?
But perhaps the most relevant term with “grex” at its root is gregicide, “involving the slaughter of the common people,” to quote the egregious (in its original sense of outstanding or excellent) OED.
What more do you need to know?