Argh!

Do you know what I hate? I hate it when the boss says "it'll be easy, just use this code as the basis of the project - we want the same thing just a bit different." Then you find the code and you find out there is no documentation, no comments and it doesn't just install and run. So then you are stuck trying to work out what the hell the code does and why it doesn't work. And its written in a language you are unfamiliar with.

It sucks.