Got a phone interview for a web dev internship while in school. I only took a very intro web design/dev course, and wasn't sure if I wanted to pursue that career. It went well in the beginning though I was getting more and more nervous. Then they asked what I learned in that class. I suddenly remembered something and rambled how the teacher talked about how outdated and not mobile-friendly tables are, and we should never use it in layout. There was a few seconds of silence and someone spoke out "well table is still very useful and we use it a lot in our website".
I didn't get the internship :-)