All tagged weaknesses

I do a lot of the interviews and hiring for our office. One of the questions that I ask our prospective employees is what they think their weakest characteristic is.

Before that, I always ask what their strongest characteristic is. They never really have a problem answering the strong one, but they never seem to be able to answer the weak one.

I'm not really sure how to interpret this. But I was talking to my wife Sam and one of her friends about it over pancakes the other day.