Watch the 20 minute demo film that eventually became ‘This Is Spinal Tap’

When ‘Spinal Tap’ came out in 1984, many didn’t understand what they were watching. Rob Reiner was still ‘Meathead’ from All in the Family in the minds of most of the movie going public. So ‘Meathead’ had made a documentary about a ridiculous band that no one had ever heard of. Those people had obviously…