This document summarizes a talk about abusing file format parsers to cause different parsing behaviors, known as "schizophrenia". It describes techniques used across various formats like ZIP, BMP, PDF, GIF and PE files that can result in files being parsed or interpreted differently depending on factors like the parsing order, which part of a program does the parsing, or which specifications are followed. The goal is to fool parsers without causing failures by leveraging ambiguity and flexibility in file specifications.