Play, written by Aristophanes, Athens, 423 BC.

In the Phrontisterion ("thinkshop") of Socrates, you can pay for learning to talk everything straight which is bent.
Phrontisterion teaches the villain Strepsiades ("twister") to argue why debts are no debts at all, and he does not need to pay them back. His son learns there, after the event, why it is good to give your father a firm beating every now and then. Socrates fills his pockets.
At the end a cheering crowd witnesses the collapse of the Phrontisterion.