Plato once said that Socrates had defined men as "featherless bipeds".
Upon hearing this, Diogenes crawled out of his barrel, bought (or probably stole) a chicken, plucked it, and ran to the Academy, holding it aloft and shouting,
"Behold, Plato! I have brought you a man!"
In response, Plato added "with broad, flat nails" to his definition.
After Sitting Bull killed his first man in battle, he was awarded a White Eagles feather.