6. "Roger & Me" (1989)
Michael Moore's attempt to have a sit-down with former General Motors CEO Roger Smith didn't really do anything to change the car company's plan to save money by closing plants in Flint, Michigan, thereby killing the town's main jobs source. But it forever changed the terms of interaction between documentary filmmakers, their subjects and their audience. Eventually the chummier relationship Moore cultivated with viewers would lead to a lot of copycats, but also over $100 million at the box office for Fahrenheit 9/11.