In Plato’s Theaetetus, Thedourus and Socrates debate what it is to ‘know’ or ‘perceive’ something. And Socrates being the annoying (but excellently annoying) bloke he was, badgers Theaetetus about what they believe knowledge actually is. Theodorus’ viewpoint gets stripped bare by Socrates to the point where everything he thought he knew is put into question. He starts to get pissed off…