I was interviewing candidates for an executive assistant position for myself after preliminary screenings by HR. One candidate I remember very well. She was led to our conference room by HR and I came in and sat down across from her. She was on her phone and didn't even recognize I had entered the room or sat down. She remained on her phone for another 30-45 seconds and finally looked up at me and said "oh, hi". I said "hello, thank you for coming in, good bye". She said "what"? I said "interview over" and walked out.
Yes, HR missed on this lady and she probably shouldn't have been invited in due to lack of experience. She was 25 or 26 years old with a degree from a private university in a useless major.
I ended up hiring a lady in her late 40"s, mother of 2, never went to college. She is intelligent, hardworking and a great team mate and colleague.