I've interviewed lots of folk, and now as part of my job train others on how to do it.
It amazes me how many folk think that making an interview a horrible, stressful, difficult experience for all the candidates is the best way to find the ideal candidate for the role. Pure ego trip for the arseholes doing the recruitment, and nothing more.
As for my personal experiences, when I was just 17 went for a job where the Managing Director told me my first mistake at the interview was the crucifix I was wearing, as he gets most of his clients through the lodge. Cringe to think I just accepted that as honest feedback at the time, but I was just a young lad...