Oldie but goldie.. after my studies, I was looking for my first job and did interviews. In one of the companies, they asked me whether I knew C. Well yes, I had been programming in C. Ah no, that wasn't enough - they asked whether I was really good in C. I got suspicious and argued that there was the project documentation anyway, right? Turned out, no. The code was the documentation, as I had suspected.
Then my question - as freshman, mind you: "Do you have any plans to get to a more professional way of developing?"
The interview was pretty much over at that point, the boss got actually angry. Well, interviews work both ways, and he had failed. I surely dodged a bullet.