movie posters tend to fallow trends and if there is a movie that did really well people try to make their movie look like it might be a similar movie so try and get the fans of the first movie to see their movie. it makes sense but it is a bit lazy and i think the over all quality of movie posters has been pretty weak in recent years. this annoys me because i really like movie posters but i guess i like the "cabin in the woods" poster so they could be ripping off something worse.