Outsourcing for fun and kickbacks
In the early 00's I ran a team replacing Nortel phone systems with Cisco VoIP phones. Since the sites were hundreds of miles from each other and required reliable service I had local servers at each location. After this was rolled out, the Big Boss in their infinite wisdom decided that everything would be outsourced to EDS.
EDS set up a call center where any trouble tickets would go into a digital black hole - they were entered, noted and then disappeared. Folks recalled that I had a hand in those phone systems, and soon I was getting calls for help. EDS hadn't bothered to remove my access, and I found myself fixing issues as they came up. After six months or so, EDS got their act together and started checking on all those tickets, only to find that they had been mysteriously dealt with.
I later found out that the outsourcing contract was a pay per fix deal, where EDS would get $40 for every password reset or name change and a nice chunk of change for a server reboot. By stepping in and keeping things running, I had ensured that EDS didn't get a dime. Their accountants were the ones to sound the alarm, since this lucrative account hadn't made the company any money.
Alas, the tale had a bad ending. I got reprimanded for not using proper channels, my accounts that I used to connect to those servers were removed (I had others) and EDS was officially in charge once more. I suspect there was money being passed somewhere, but wasn't stupid enough to learn more. My workload went back to normal, aside from the occasional request from a boss's administrative assistant. I took care of those!