Once, as he was getting on past boyhood, he accosted a school-teacher, and asked him for a book of Homer. The teacher replied that he had nothing of Homer's, whereupon Alcibiades fetched him a blow with his fist, and went his way.
Edition :
Plutarch Lives IV: Alcibiades and Coriolanus, Lysander and Sulla, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 80), Harvard University Press: Cambridge/MA - London 2000 (first ed. 1916).