[throwaway892238]

You don't need an example if you care about the job and what the company is doing. Just speak from your heart, and tell them why they should hire you. Why do you want the job? Why do you care about the company? What do you want to achieve there? What experience do you bring that you think will help them with their mission? Show them you aren't just submitting the 351st application for a job. Show them you want to work there, for them, that you're the right person for the job. ...And then bring it down a few notches so it sounds 'professional' (confident without being needy or arrogant).