Movies are both an art form and a business, so while it's the artist's vision that dictates the direction, it is sadly entirely up to clean shaven men with business degrees to decide how to sell it. And while we understand it's their job to twist the truth to maximize a movie's appeal, sometimes they go completely insane and just start making shit up. Occasionally, they hit on a better idea than the movie ever did...
...but mostly it's just this kind of crap:
15District 9 - Thailand
District 9 was a mockumentary about aliens living in a shanty-town in South Africa, all but stripped of their precious technology. It was a parable for racism, and yes, a single 10- to 12-foot robot suit figures in the plot.
So why is that giant robot smashing an entire city beneath his boot-heel and swatting the tiny helicopters out of the air? Hell, if you have to make blatantly false giant robot claims to sell tickets in Thailand, why not just fill the poster with a whole army of...
14Lord of the Rings - Spain
Europe loves depressing, hopelessly bleak tragedies about people dying slowly, or perhaps in a concentration camp. So when the movie promoted is roughly 270 minutes of dragons and elves screaming while running with swords, you're pretty well screwed.
Your only option is to promise the audience a black and white movie about a grandfather who hugs little boys and hope the Spanish don't have a word for "refund." This isn't an action movie, guys; it's an Oscar winning flick about hugs, sad goodbyes and eccentric old men with funny hats. Who probably dies of cancer in a concentration camp.