Originally posted by KetchupPartially. Except teasers are shown in theaters for "Coming Attractions" as well. The teaser gives no real outline of the story, it just 'teases' you with visuals and snippets of dialog. The theatrical trailer gives a bit of the storyline away, and give you a feel of what the movie will really be about. Some spoilers may be included with it, so some people refuse to watch any theatrical trailers.
Well, SomeGuy57 (love the ketchup number there), a teaser trailer is meant to tease us, as that surely did. A theatrical trailer is a trailer shown in theatres for "Coming Attractions"