Philip K. Dick On Philosophy

"Empty talk," Joe said. "It doesn't matter. [...]You know the old brownshirt term for people who spin philosphy? Eierkopf. Egghead. Because the big double-domed empty heads break so easily . . . in the street brawls."

- Philip K. Dick, The Man in the High Castle

[Note: Etymology sources differ, generally claiming "egghead" is an early 20th c. term for baldness.]