This interviewee doesn't have to have been directly involved in an historic even. His or her indirect experiences--as a bystander or witness--can be just as powerful. Also, it doesn't have to be a single event. For example, living in the south during segregation or growing up on a farm can be extremely powerful interviews.
This example is a son's interview of his father about his father's political experiences in India and the United States. It was part of last semester's Podcourse (forgot to post it here), and I'm using it as an example for this semester's students.