This is a tough question to answer without dipping into platitudes. Try sharing leadership examples instead. Say, "The best way for me to answer that is to give you a few examples of leadership challenges I've faced," and then share situations where you dealt with a problem, motivated a team, worked through a crisis. Explain what you did and that will give the interviewer a great sense of how you lead.
You should think hard about how you can differentiate yourself from others -- every step of the way during the interview. Be memorable in a positive way even when answering these "boring questions." And, to be well-prepared to give smart answers to behavioral interview questions, read my article Smart Strategies to Answer to Behavioral Interview Questions
"Choose an answer that shows that you can meet a stressful situation head-on in a productive, positive manner and let nothing stop you from accomplishing your goals," says McKee. A great approach is to talk through your go-to stress-reduction tactics (making the world's greatest to-do list, stopping to take 10 deep breaths), and then share an example of a stressful situation you navigated with ease.