[imtringued]

The stupidest over engineering pattern I've seen is having an interface for every single class in a Java project. This may make sense if you are building an API within a framework or library that people other than you are allowed to implement but when the interface is only used within the project it was created in then it is absolutely meaningless to add the interface before you need it. You can always add a necessary interface later by editing the code. Doing a search for "ClassName" and replacing it by "InterfaceName" isn't exactly difficult.