Day Boy Question:

This negative question not only exposes me to the candidate's negative points but also about how well can he sell himself.

Please note - I, as an interviewer, don't take negative qualities, except excessive anger, racism or any kind of discrimination, as a rejection point. For me, negative points mean a well aware candidate. The organization will provide him environment to get rid of the negatives - after all that's why we have a Learning & Development team.