My wife used to work as a webdev at a shop that made its bread and butter contracting out some devs to do M/MUMPS development for a bank. Truly horrifying. The language/DB, but also that this thing was involved in handling people's money.
There are new projects done in MUMPS in finance all the time :|
I very briefly encountered MUMPS in grad school and its eldritch horror has remained seared in my brain.
In true Cthulhu fashion, after encountering it at a medical facility where the lead programmer bragged about how amazing it was, I bought a book on the language. I like collecting language books (Icon was fun), but that was rather painful to read through and I have done IBM JCL and found it not unpleasant.
The NY Times a few summers ago wrote up some firm in Wisconsin that handles data-processing for quite a few insurance companies, using MUMPS. A co-worker's son a summer or so before had weighed competing internships from that firm and from a financial company in New York. I said I thought that the latter would offer more portable experience.