I have tried on two different occasions to try and learn J, and I have failed both times.

It always felt like one of those things that could be extremely neat once it "clicks" for you, but I have never been able to get over the initial hump of it. I like to think I'm able to adapt to arcane programming syntax fairly quickly, but J kind of broke my brain and it never became natural to me.

Still, I do think I should probably just power through it and actually learn it, just because it feels like a loose thread I need to pull. Forth too, actually.