The question is too broad, but along the lines of Norvig's answer... There's a particular micro-expression I sometimes notice with people who are working on a software problem. I notice it when something goes wrong unexpectedly. People who aren't particularly talented at SW development, for a brief instant, give a facial expression of disgust when something crashes or behaves incorrectly. People who are awesome at de…
I find failures interesting too, but I'm not feeling happy when I expect the reason will be because the tooling I'm using hides information behind insufficient logging or the answer I seek is probably on a system I don't have permission to access.