My GF did this (Score 3)

My girlfriend worked in a place that decided that XP was the way to go. It completely and totally failed.

Basically, everyone walked over everyone else's code, things never once worked properly. Without any sense of forward thought, basically the project went to a standstill.

The situation wasn't helped by the fact that one or two incompetent programmers on the team destroys the whole project. My GF was one of the few intelligent coders on the team, largely the reason that any forward progress was made (as vague as progress was). However, pretty much every day, someone stupid would destroy her code under the guise of XP's constant state of refactoring.

It cause numerous conflicts between the programmers and a few people quit, including my GF.