Epicurus’ first school-day

.
…only lasted a few minutes.
'In the beginning there was only Chaos', the teacher told his students.
'And what was it created from?’ asked Master E.
T: 'We cannot know this: this is a question with which the philosophers concern themselves.'
E: 'And why, then, should I waste my time here? If you don’t know this then I rather go to the philosophers themselves!'
And so he did.

Further info: Sextus Empiricus: Adversos Mathematikos (X, 18), Luciano de Crescenzo: The History of Greek Philosophy: Socrates & Beyond [I also would recommend latter work of two volumes to the educated layman].