This interesting video by filmmaker Steven Benedict explains the origins and evolution of movie trailers in American cinema. From the first in 1912, for What happens to Mary, to Kubrick's great Dr. Strangelove, or the latest Hollywood blockbuster trailers.
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Man the Exorcist, Jaws and Alien trailers still give me chills.
70's - early 80's were the best time for horror/suspense movies.