Public service announcements in movie theaters?

Just read an article about how St. Joseph's Healthcare will be advertising in southwestern Ontario (Canada) movie theaters about their services. Which got me to thinking (always dangerous)...wouldn't it be wonderful if the U.S. movie entertainment industry stepped up and included public service announcements (PSAs) at movie theaters (and on DVDs). After all, if they charge $8 to see a movie (and charge $29.99 for the new DVD of that movie), it seems the least they could do is devote some time to PSAs (hint: y'all could make them very brief and entertaining).