The basics of it were this. Django Template (almost any templating language with inheritance will work). The first is a base template, several hundred lines long, and within is a neat little block like:
Then there is the template that inherits from the base, also several hundred lines long. It gets to a point like:
Now, this post completely gives away the fact that I've hidden functional code inside a comment. However, imagine that instead of a bunch of sarcastic code it's actual business logic that conforms to the rest of the way the terribly written project works. Now imagine a low level "experienced" developer who commits the sins you see on this forum try to debug a minor problem with that function.
So, yeah, code review.