Explore the inner workings of Python's built-in data structures in this 26-minute EuroPython 2020 conference talk. Delve into object internals, uncovering what happens under the hood when working with Python's data structures. Gain insights into memory management, object creation, mutability concepts, and the behavior of various operations. Learn the differences between deep and shallow copying, list sorting methods, and the distinctions between 'is' and '==' operators. Discover how to determine memory reference IDs and understand variable assignment in Python. Suitable for those familiar with Python's built-in data structures, this talk aims to demystify surprising behaviors and provide a deeper understanding of Python's inner workings through engaging examples and visual representations.