<human>: this requires a little explanation, but please bear with me.

So, The Avengers has so far been the biggest movie of the summer, and, not surprisingly, it had a huge ad campaign. Practically everybody who went to see the movie already knew by heart the exchange between Captain America and Iron Man (Cap: "Big man in a suit of armor; take that away, and what are you?" Stark: "Genius, Billionaire, Playboy Philanthropist.")

In the preview, Tony Stark gives off the line with his classic Stark snarkiness and a big grin, playing the line for laughs, but in the movie, the exchange takes place in the middle of a heated debate, with tempers mounting on all sides, and he gives the line in an undertone of loathsome disgust. Now, of course it's normal for certain parts from the trailers to be changed or removed from the final cut of the movie, but this is different. The way that Stark gives the line in the film is in direct contrast to the audience's expectations: an element that was meant to be lighthearted is instead used in one of the heaviest scenes in the movie. For future audiences (or for anyone who somehow managed to miss all of the commercials), there's nothing wrong or incomplete about the way the line is given (or the scene as a whole), but for those who were already immersed in the advertising, it gives an extra little oomph to that scene.

So my question is, are there other examples of things like this? Other movies that deliberately misrepresented some aspect of the movie in their ad campaign, be it a single line or an entire theme or plot arc, so that the audience would be thrown off when they actually saw the movie for the first time? Something that would be lost on people who hadn't seen the ads?

Can you provide a brief overview of the text?
<bot>: THE AVENGERS PLAYED AGAINST YOUR EXPECTATIONS OF THE MOVIE BASED ON ITS OWN ADVERTISING CAMPAIGN FOR GREATER EMOTIONAL EFFECT. WHAT OTHER FILMS HAVE DONE THIS?