I went to one interview a few years ago for a position on a council helpdesk and was taken to the fifth floor, the staff member taking me through various doors with a security card.
I was put into an office on my own and told to read the instructions and when the phone rang, to answer it and deal with the complaint from a staff member posing as a member of the public, then write up a report on the complaint. When completed, I would be taken in for my interview. I realised quite quickly that this wasn't the job for me, and would've left there and then, but I couldn't as I had no security pass and didn't know where everyone was! So when I was collected for the interview and was asked how I thought the task went, I just said I'd not done very well, and pointed out my mistakes and what I should've said, or not, feeling very relaxed as it just didn't matter if they didn't offer me the job as I didn't want it! I'd never been so relaxed in an interview before! Before I even arrived home, they rang (I knew I was the last person being interviewed), and I thought 'Gosh, I was so bad, they can't wait to tell me!' Not at all! They said they were very impressed and would like to offer me the job! I was so shocked, I just blurted out 'You've got to be kidding!' to which I was asked whether I would like to accept!! And I must've been in shock, as I said 'yes please'! But I really didn't want it! However, I stayed there for 18 months and I did hate it, but through that job, I ended up working in another department in a job I loved!! I asked my boss later why they'd offered me the job, and she said it was because I was aware I could make improvements, and I would therefore be easy to train on the job, and they get too many interviewees 'bigging themselves up' and being overly confident about their capabilities!
Another time, I went for an interview as a school secretary in the school where my husband taught. The post was filled by a long-term supply person (months at this point), but I didn't get the job because they didn't know that it was a good idea to work in the same school as my husband (!!!!!). The long-term supply person had also applied to take the post on a permanent contract, but she didn't get it either! In fact, no one did, none of us were good enough (despite me already being an experienced school secretary!), yet the supply person was obviously good enough to be kept on for a further long-term spell, before they re-advertised the post again. No idea if she applied again! Glad I didn't get that job! Though my husband taught there for years!"