This just popped up on Youtube (or rather, I just found out about it) so I thought I'd share it with you guys: the original 20 minute short version of Spinal Tap, to show investors what the movie would be like.
https://www.youtube.com/watch?v=UGfZOpzfxFM
https://www.youtube.com/watch?v=MHdVhEN_pBQ