I did a code review a while back with a new Web/Software Engineer II hire (I was not involved in the interview process) and noticed they were doing an HTTP GET request when they should have been doing a POST (attempting to change some values in the backend/database).

I talked to him about the issue, just chatting about GET, POST, PUT, etc...and all I got back was a deer-in-the-headlights look. He responded "I...I don't know what any of that is."

:(

I now ask "Can you explain what are some differences between an HTTP GET versus POST request?" with every web developer interview I do. If they get that one wrong or cannot answer...I don't bother with anything deeper.