I learned a bit of KOBOL after hearing it was the weirdest, hardest, and most unused programming language back in highschool. But only really enough to do a hello world and other very simplistic programs. More because finding resources at that time was difficult.
I tried to learn some back around 2019. I don't remember why, but there was something going on relating to it at the time? Maybe it was as simple as me reading an article about Cobol devs retiring.