weakness and failure questions
"Tell me about your failures....", or "What are your greatest weaknesses......". are the interviewer's equivalent to "Are you still beating your wife?..".
Don't be intimidated by these questions - you don't have to state a failing or a weakness just because the interviewer invites you to.
"I don't generally fail", or "I really can't think of any", are perfectly acceptable answers. Short and sweet, and then wait smiling for the come-back - you'll have demonstrated that you are no mug and no pushover. If you are pressed (as you probably will be), here's your justification answer, or