What are your weaknesses?

(A "good" weakness might be that you have trouble leaving the office behind when you go home in the evenings.)

This is a very difficult question that is not asked often, but it's one you should prepare for anyway. If you talk about your temper, your tendency to gossip or the fact that you're lazy, you may as well pack up and go home right then. If you mention a weakness such as your lack of patience with people who don't do their share of the work, you should also mention that you keep this impatience to yourself and try very hard not to express it toward others.