This drug-abuse PSA from 1972 fascinated me as a kid. It's much better than any contemporary PSA about drug abuse.
(Via World's Best Ever)
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects