This can be a very interesting question and an easy one in which you can shine by showing your enthusiasm and expertise. Pick an example where you had to call upon all your talents, strengths, skills and reserve. It could be a time when your last company was going through a serious challenge. Or just a time where you can “recite” the who-what-where-when and how you got something accomplished.
I always think of big examples like 911 with the air controllers and 911 operators that day. How did they manage to bring all planes in the skies down safely? What of the accountants who first discovered the Madoff Ponzi schemes and other fraud that brought down the financial giants in NYC? The fireman who brings a child out safely from a burning building that already “flashed over”? Your anecdotes may not be that extreme, of course. Think of when you brought in money or customers, got awarded, if you did, saved the company time in the process to perform something, or just a day at work that was very gratifying. Your recall and story in an interview will flow because it will be on the tip of your tongue and it will, no doubt, be something you are proud of, or will never forget. It could be something so simple as some humble duty you performed that felt good or one in which a boss or customer complimented you. Remember to tell the details. Start out with what it was and go from there—who it involved—you and/or team—what the challenge or duty was—how you had to meet and resolve it—and most importantly—what became of what you did!
Interviewers want to hear initiative, critical thinking, how you problem-solve and outcomes—results! Mostly, they care about saving time and money and making money. So tailor your answer as closely as possible with that in the back of your mind. Tailor it to your field to make yourself unforgettable and a standout.


