Flip side of the coin
I've actually done a lot of interviews myself, and have been shocked by the quality of some of the candidates - good and bad! But one always stands out in my mind.
I was working for a highly skilled technical consultancy company, and we were looking for someone who could come in to lead a load of software projects (we had rather more work than we could cope with at the time), and basically crack the whip over the softies and keep them honest. The role was partially project management, but also needed someone with dep hands-on knowledge since they would be expected to sort out any messes as they occur (either directly, or by guiding the softies to the solution). We had someone apply for the job who looked just perfect; they currently worked for a certain three-letter company where everyone wore blue shirts, but were looking to move to pastures new and fields greener - they had been at their current company for a good two decades.
My boss held the interview, with me backing him up to provide the technical muscle. However during the first 30 minutes of the interview, I began to get more and more uncertain about the candidate - his answers simply did not stack up in my mind. Eventually I asked my boss if I could interrupt him with some of my questions, and was given the go-ahead.
Me: In your CV you said that you had done X, Y and Z over the last few years. Did you, personally, do these?
Interviewee: Ahhh ... no, people who worked on projects that I was responsible for these.
Me: Did you have any input when X, Y and Z was done?
Interviewee: Ahhh ... no, the project leads dealt with all of that.
Me: So you have lied on your CV then?
Interviewee: Ahhh ...
The interview only lasted another 5 minutes before my boss closed it and sent the interviewee home with his tale between his legs.