I generally don't go for Cracked articles but this one made me smile.
I totally used a bit from the introduction of "Perversion for Profit" for my second skit comedy DVD.
The prelinger archive has a ton of PSAs like this and old movies like "Reefer Madness". The best part is that you can use the footage in any media project you want for free. Oh I spent many days in college looking over this material.