In 1970 USC film student Randal Kleiser shot "Baby Peace," a one-minute ad to protest US involvement in the war in Vietnam. He got Jon Voight, fresh off of Midnight Cowboy, to do the father's voiceover.
It kind of hurts to watch because, as Xeni points out on boingboing, it could've been made yesterday.
Baby Peace [boingboing-hosted quicktime, wmv]
Randal Kleiser filmography on IMDb [Blue Lagoon? Grease?? The Boy In The Plastic Bubble??? The man is a film god! Big Top Pee Wee? Not so much.]
ouch.