I'm usually nice to people and try to look for the best in them... but this one time one of my colleagues gave me a code to review that, something about trees, can't remember, and the function was hammering the databases with 3 nested cycles, that's when I could no longer just watch. I was kinda mean on him that day, but as a result he did fix the problem and was really happy and I sensed a bit proud of himself as well.

Long story short, I believe he's not a software dev anymore. Kinda shame, I liked the guy, but he seemed enthusiastic of his new job and that is all that really matters in the end