I think because early in life I read 'Great Answers to Tough Interview Questions' by Martin John Yate - highly recommended - very little people could ask at interview would surprise me. For instance the two questions mentioned above I would pretty much regard as classic staples - my only comment on the perfectionist answer is that it may be a cliche - but is still probably the easiest way to dismiss the question. For the failure question I have tried, with some success the old 'colleague was a prick, tried to bring him on side, but he got the boot anyhow'.