Re: Guy I used to work with...
I've been doubly triggered from your comment. First as an affected in this Rackspace fuckup (We've migrated to GCP, goodbye RS), second, as a former worker of the radiology industry:
Switching off the power to an MRI by accident is one of the biggest and dumbest things you can do there. You aren't only losing money while it's down, but you're probably forcing a quench on the machine, venting all the helium, scaring the shit out of everybody, with risk of freezing or suffocating somebody, you're probably going to break a bunch of parts of the MRI machine (that's very, very, very expensive), and will have to take the machine out of service for days or weeks. Depending on the size of the machine just the helium fill could be, easily, tens of thousands of Euros/Dollars...
Even on simpler MRIs with no helium cooling the maintenance after that could be quite a mess.
I would have removed that door personally on the first occurrence of that incident, and fired they guy the second.
Biting the hand that feeds IT
