Getting into COBOL to be able to write your own checks is a valid answer.
Yes. Clisp to Java to Scala and to the Java finally. Every switch was to get more money. As a result in the end I got more money and more domain experience. Most switches were traumatic for a week and then it was back to normal.
Changed from ColdFusion to C#. I was able to stretch minimal C# exposure during a contract into enough experience to convince someone to give me a full time gig where I was able to learn on the fly. I did pick up some bad habits that I had to unlearn as I gained more experience.
Sort of. I was a "language of the month" hobbyist. Then Visual Basic and Access with VBA came along and I could actually be productive enough to ditch my labour jobs in favour of a small freelance operation that generated comparable income, but was way more fun and much easier on my back and joints.
Twice so far.
Proprietary language to commonly used language - Got something on my CV that other future employers would appreciate more. Also was a chill job anyway. But I got bored.
Then I hopped jobs to another completely different commonly used language (not just different in syntax, but one that required a completely different way of thinking about things). I learned a lot, but project itself was way too stressful, so I quit at the end of my probationary period. Not a good outlook on my CV, but overall I can, without lying, say I pick up on new languages and frameworks very quickly and if I get a take-home assignment in a language I've never touched, I can still complete it in a reasonable time frame. So there's some good out of it.
Both times also came with a significant salary increase so that's also nice.
I'm withholding details about the languages because I might be too easy to identify given I've also mentioned my homeland in previous comments.