10 Ways Trailers Let You Know A Movie Is Secretly Awful

3. Heavy Use Of Off-Screen Dialogue

An editor of movie trailers elaborated on how this worked during a discussion on Reddit, explaining how "they're either lines that have been cobbled together that don't actually exist that way in the film, or they're lines that have been squeezed into an actors mouth when they're saying something completely different in the movie." So what can we make of this use of dialogue?

According to our industry insider, such decisions "usually indicate a lackluster movie because the editor/studio is fabricating something, as opposed to letting the natural material work on its own." If you add to this the absence of any dialogue from the main character during a trailer (another red flag worth keeping an eye out for, since this suggests an awful performance), what you're left with resembles something like the following trailer. No, Shyamalan! No!