CLICKThe Maryland Public Secondary Schools Athletic Association P.S.A. "Proper Care Of A Teenager." As you can see, they weren't afraid to show the ending (which for the time it was in circulation would've ruined it for many).
CLICKNot only that, it WAS pretty gruesome to show it on TV at that time period...and if you couple it with the "3rd rule" of the proper care, it makes it even more graphic. See for yourselves:
http://www.youtube.com/watch?v=Q1ETAvhS-Ds