A popular device in television advertising these days is to put a group of young people into a car with a camera and portray them as making a documentary, apparently winging it. They pull up in unfamiliar places, shout questions to strangers, and then move on. There are circumstances in which you might want to do this, but in general, this isn't an effective use of time, unless of course it's part of a thought-out film design. In Super Size Me, Morgan Spurlock effectively conducts a number of these "man-on-the-street" interviews. While not a random sampling, these people seem to represent the average person and his or her knowledge of fast food, nutrition, and in one case, the lyrics to an old McDonald's jingle. This can be fun and effective.
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