Schlock! The Secret History of American Movies is a very good serious (but not overwhelmingly so) documentary about some of the history of 50-60s-era exploitation industry. "Some" means snippets of all of the living people like Roger Corman, Vampira, and Sam Arkoff that the director could get his hands on, in conjunction with cool snippets from various exploitation films reflective of various sub-genres. If Reefer Madness and a little 50-60s-era nudity and gore is your bag, this is a worthwhile rental.
