One of my favorite interview questions is: Tell me of one mistake you made and what happened.  Tell me of a second mistake. Tell me of a third.

Often a prospect will have one or two readily available, but have to resort to bare honesty by the third.

You can learn a lot about them from them this way.

Client K writes:

If someone says
they never make mistakes,
that simply means
they’re not intelligent enough
to recognize their mistakes.