"One man illustrated proper logic with this syllogism:
All men are mortal.
Socrates is mortal.
Therefore, Socrates is a man.
I raised my hand. "Birds are mortal too, aren't they?" I asked, hoping he would correct his error.
"Yes," our teacher agreed.
"So Socrates could be a bird?"
He smiled benignly. "No. Socrates doesn't have feathers."" - Bauman, 'But Can You Teach?'.