Something similar. Took almost an entire ISP down. Had a few servers with about 200 domains running bsd located at thier "data center " which was more like a couple shelve and a long bench. Anyways, they where supposed to be running a script to verify two servers were mirroring the other two. I got lazy and stopped checking the logs for it and eventually they stopped running the backups or the script to verify it. One day a drive failed and about 50 domains were off line. I couldn't remote into any server and started getting a run around from their techs so i loaded up all the backup servers i had and a file share with copies of everthing and drove the 200 miles to the isp.
Turns out one of their techs tried to fix the problem by pulling a good drive from one of the other boxes but wasn't the one mirroring the bad drive. This then caused issues in the raid for the good box which he tried to rebuild by pulling the a drive from the mirroring box and ended up breaking all the configs. The worse part is that he thought he had the right tools to fix everything at home and instead of going to get them, he loaded my servers up and took them home.
So i show up, realize i have to start from scratch, set up a couple makeshift boxes that likely wouldn't survive a month, then i connected an old NetWare server. I enabled SMB on the two new servers and started transferring files from the NetWare server. Next thing i know, someone came in and started rebooting all the routers. I looked and jokingly said a reboot is not a fix.
Well, this went on for about two hours with about half a dozen people working on it, making phone calls and claiming they were under some DOS attack. My file transfer was finished, i disconnected the NetWare server, and it all magically stopped. I had misconfigured the SMB and created a packet storm that their routers and modems gladly repeated and multiplied to the point it almost melted their network.
My real servers finally showed back up so i loaded them up, built new ones and had a t3 ran to a commercial building near the house that became their new home. There was a lot of finger pointing and talk about compensation but it got dropped when i reminded them that the only reason i had access of that kind was because they failed to fulfill a contract obligations and then screwed the pooch trying to recover.