For my very first job interview, I joined a rather well known company (somewhere in the mid-ranges) as an intern-frontend developer. Everything was going okay-ish. I was asked some technical questions and I answered them to the best of my knowledge, and it was all good until he came to the javascript questions.

Interviewer: So, have you worked with any frontend frameworks?

Me: Yeah, I usually work with vanilla JS, but I've gotten into frameworks like Backbone and Ember.

Interviewer: I've never heard of those. Do you know AngularJS?

Me: I've dabbled aroudn with it, although I haven't gotten into it much. If you want me to use AngularJS, I can pick it up and get the ropes of it pretty quick.

Interviewer: So tell me.. what is AngularJS?

Me: It's a Javascript framework released by Google (explains what it is and how it differs from most popular JS frameworks, explains the components of Angular.. etc)

Interviewer: Well, you're wrong. It's an enhanced html for web-apps. ( or some bullshit he quoted off the front-page of the then angularjs.org homepage )