→Subscribe for new videos every→“trailers” because the advertisements would be spliced directly on the end of the reels, so that the movie advertisement’s film trailed the actual film. Want the text version?: http://www.todayifoundout.com/index.php/2011/08/why-short-movie-advertisement-clips-are-called-trailers/ Sources: http://www.straightdope.com/columns/read/2270/why-are-they-called-trailers-if-theyre-shown-em-before-em-the-movie http://en.wikipedia.org/wiki/Trailer_(film) http://en.wikipedia.org/wiki/Don_LaFontaine http://en.wikipedia.org/wiki/Psycho_(1960_film)