Several years ago, I had a class that refused to believe that Pocahantas and John Smith weren't married. After all, the Disney movie had them convinced and why would Disney be wrong about history. :)
In using Reading Like a Historian, they have a great lesson plan discussing this very topic. As I've gotten my materials pulled together for this lesson my co-workers couldn't believe how many students really thought the movie was true.
We did a quick survey of students in the hall, including some older students I had in that first class. They couldn't believe I was actually going to show my class the movie (about a 5 minute clip) because I had refused to show it to them. I can't wait until Monday to see if this group of students has as much faith in the movie as my Disney loving class!