I can't believe no one has mentioned The Wizard of Oz!
Back when I was in college, an Iranian friend of mine got stoned for the first time while watching the Wizard of Oz for the first time. When we got to the flying monkeys, I had to take him outside for fresh air and help him walk it off. He couldn't deal with the monkeys!
Has anyone else played Dark Side of the Moon while watching the Wizard? It is pretty strange. You start the album [back then] at the third roar of the MGM lion.