Wrong. It's exactly the place for both of those things.
For every instance in the class QuestionsAskedToMe, including "What is your greatest weakness?", I have a simple rule: Just tell the fucking truth.
If you're so concerned that the telling the truth in an interview can come back to haunt you, then you shouldn't be interviewing with that company in the first place.
[My answer: I am very impatient. I always have been. People close to me have even pointed it out. (My brother reminds me for every time I make a hasty decision.) Sometimes this has served me well, but it's also caused problems when working with others. I have made a lot of progress trying to be more patient, but I still have a way to go.]