THEERE ARE NO MISTEAKS!
1. A false notion.
2. A statement or an argument based on a false or invalid inference.
3. Incorrectness of reasoning or belief; erroneousness.
4. The quality of being deceptive.
Pila was famous (or infamous, depending on to whom you talked). He gave a number of lectures with a perfectly straight face that were setups for outrageous puns, or veiled references to silly fads. (he would spend an hour setting us up....) There are fragments of these lectures here.