“In every project there is always one file that strikes fear into the hearts of all programmers everywhere. These files are usually full of code that could render a battle-hardy coder to complete gibbering tears within seconds and that is just for looking at it – if they have to make changes to the file then they usually make their farewell calls to their loved ones, have a swift drink of something to bolster their courage and run into the battlefield screaming as they go. Somewhere in the world is an honour monument to those who fell.”
– Byron Atkinson-Jones of Introversion discussing game UI, though his comments apply equally well to any project.