Reefer Madness (1936)

I am not recommending that you actually watch this entire movie (it is only like 65 minutes long) but it is a funny public service announcement on the dangers of the new Public Enemy #1, Marihuana.  This movie was put out to warn parents of the dangers that this new drug will cause for their children and society.  The way it is depicted is interesting, because even as the kids are high, they still are well dress and mannered.  It was an interesting watch simply because of when it was made and how it was presented.