Some films, on the other hand, give away what is often the most diverting thing about their film just to ensure that you actually go see it. Take Terminator Salvation, a hugely disappointing film that nevertheless had an impressive plot twist, that Sam Worthington's Marcus Wright seemed to be a Terminator who thinks that he's human. While the trailer still kept things somewhat ambiguous, how mind-blowing would it have been if we went in knowing virtually nothing about Wright, and then this blind-sided us? Given that it is revealed a good way into the film, to ruin it in a trailer seems like a desperation move, presenting a hook to try and ensure that people go see the film. But let's be honest, it's a freaking Terminator film; people will go and see it.