At one of my clients, Andersen came in to one of my projects (this was the Andersen Consulting side, not the accounting side) and immediately put some of their programmers (I use the term loosely, they were college kids with Liberal Arts degrees who'd never coded professionally in their lives before this point) working on a software bug tracking system, unbeknownest to me.
As I made my rounds through the project, I asked them to show me what Andersen had told them to be working on that was so important that they could avoid the programming assignments that I had given them.
They proudly showed off their software-bug-tracker program.
I asked them if they had slept through their briefing a month before because we already had a bug tracker program. Not only did we already have it, have everyone trained on it (except the new Andersen flunkies), and have years of software bug logs managed by the program, but the program that we were using was superior to what these kids wrote (and it only cost $50 per copy because it was off the shelf).
Then I found out that Andersen Consulting had billed my client for the time of all of those new Andersen programmers to write that bug-tracking software. Worse, Andersen called in my client, said that we were now over-budget (but didn't admit why), and then insisted that my group use their new program because of their time/money investment in it!
Years of software bug logs, including the current bugs in the soon-to-be-released version of our software, was lost because the Andersen kids couldn't transfer the data from one system to the other and Andersen's politics prvented us from using the old system.
It was a true disservice to my client. Hey, my firm got paid for all of our employees' time on that project, but the quality of the final output was reduced because we lost the ability to track legacy/recurring software bugs (because the data was politically off-limits).
Eventually the bug-tracking software from Andersen died its own cruel death after irreversibly corrupting its own data and refusing to run to anymore. So back to the off-the-shelf software bug-tracker we went.
The only silver lining in that particular Andersen rain cloud (and I've got many from various past and current clients) was that the new Andersen programmers were kept away from coding on our development project while they were busy playing with their bug-tracker software.
Of course, each of those kids was getting billed to my client at $180 per hour by Andersen for said playtime...
Four years later, the cost had reached over $140 million, and they still weren't done. We pulled the plug on them and said it WAS done. Of course it didn't work right, which cost us probably another $100 million in related expenses.
Unbelievable.