Few years ago I was asked to give advice on a project. There was an intern doing all the work and I even gave him almost ready code to use. And he didn't use it even properly.

And best part is that they thought at the time that it would be finished in couple of months.

After few months I took over and had to deal with the "intern code". Almost all of the code is rewritten.

Status of the project is now very good. We are implementing new features and it has even passed strict security audit done by other company.

Sadly I can't drop any names etc due to NDA.