6) This Is Spinal Tap (1984)
When the music mockumentary This Is Spinal Tap was first released, the majority of audiences believed that the band was actually real, despite there being a message in the credits that states “the band Spinal Tap is fictional. And there’s no Easter Bunny, either!”
Ironically, the cult success of the movie allowed the three actors who played the group members to record actual albums which are now available on a digital download store near you!