Here is another AC story for you: I worked at a bank in the late 90s, on a crunch y2k project that was instigated because AC knowingly installed a non-y2k compliant set of core systems in about 1997, and didn't pass on the vendor's warnings about y2k to the bank management.
The AC project (which ran about 93-97) went kinda rogue, the bank management lost control of the situation. The AC project managers kept bringing in more AC consultants and told the bank management not to worry, everything was good. They were heavily customizing a non-y2k version of the vendor's software, and the vendor warned project management that they were customizing this in ways that would prevent future support and patches, but AC project management covered this up.
Eventually the vendor contacted the bank CEO directly and said "what are you going to do about the y2k issue, we are concerned". CEO: "What y2k issue?"
The bank had to go live with what they had, fire and blacklist AC and burn tens of millions of $$ to re-start the project to deliver exactly the same thing, but using a y2k-compliant version as a starting point, and removing as much customization as possible so they could take future vendor patches.