Interviewer:  Tell me about a time that you made a poor decision.
Kevin:  When I was first working as an auditor, there was a problem with one our client's accounts.   I tried to contact the client, but no one answered the phone.  I looked for a solution to the problem for 6 hours, but I couldn't find one.  Finally, the client returned my call and I found out the mistake was just a simple typo. 
Interviewer:  Oh no!  That is terrible.
Kevin:  I know.  I wasted 6 hours looking for a little detail that was not important.  
Interviewer:  What did you learn from this mistake?  
Kevin:  I learned two things from this experience.  First, I learned not to worry too much about the very small details.  Second, I learned that I should not be afraid to ask my senior colleagues for help.  When I told my senior colleagues that story, they all laughed at me and told that they could have told me that and saved me six hours if I had asked. 
Interviewer:  Well, sometimes, you need these experiences to learn.
Kevin:  I completely agree.  I have never made the same mistake again.