Interviewing for an admin assistant type role, we had quite a few fairly young inexperienced candidates, but we were looking at it as a training role so experience wasn't neccessarily an issue, we just wanted someone bright, with a bit of initiative, who could learn the role.
But one young guy really stood out for the wrong reasons. We asked him a few basic questions, based on his CV. According to his CV he'd got good A level grades, and done a bit of retail work since leaving school. That gave us some hope that he'd be bright, and capable of the customer service type bits of the job, answering the phone, booking basic orders etc.
We asked him how he would deal with an angry customer on the phone. 'Um, I don't know...' then nothing more. We asked him what he would do if he didn't know the answer to a customer question. 'Um, I don't know...', then nothing more. Every answer was the same. I gave him simpler and simpler questions, hoping to get somehing, anything out of him, but he apparently knew nothing. I don't know if it was nerves, or just that he had no clue.
He didn't get the job. Which I was gutted about because my boss had told me not to hire a man for the role, because he only wanted women in the role, so I really wanted to hire a man, and he was the only one who applied. (And no, I didn't work for that boss for much longer.)