I work for a bank. We have to do a full DR test for our regulator every six months. That means failing all real production systems and running customer workload

I work for a bank. We have to do a full DR test for our regulator every six months. That means failing all real production systems and running customer workloads in DR, for realsies, twice a year. We also have to do periodic financial stress tests - things like "$OTHER_BANK collapsed. What do you do?" - and be able to demonstrate what we'll do if our vendors choose to sever links with us or go out of business. It's pretty much part of the basic day-to-day life in some industries.