Detroit urban myths are like those of any other city. Some of them have roots in reality, some are just the result of pranks, and some develop over time as a way to explain something unusual. Take, for example, Detroit's "knock-knock streets." The story goes that if you drive slowly down a certain street, the ghost of a child who was killed in a car accident will knock on your car. The specific street changes from decade to decade, and there's never a record of an accident at that location. That's one clear case of Detroit mythbusters.
Here are a few more to test your detecting skills.