In this talk we will discuss why the famous "Shape" and "Student inherits Peron" examples, shown in a lot of forums, don't match at all the OOP principles and are in fact bad examples, and even how most Design Patterns lessons didn't really created better object oriented programmers. Instead, we will show how we can build a real OOP thinking and upgrade our design skills. We will use real world examples in C++/java/c#.