Comedy actors such as Adam Sandler or Owen Wilson adopt a look of contempt or happiness to promote their movies, while action stars like Liam Neeson use angry or disgusted expressions.
These are the findings revealed by a leading film data researcher who used facial recognition software for 7,617 movies to find the formula used by studios to attract audiences.
Stephen Follows' study of films from 2000 discovered that for each genre of movie, their corresponding poster displayed a certain emotion to try and bring in a crowd.
Adam Sandler (left) adopts a look of contempt to sell his comedy films, such as 'Click', while action stars like Liam Neeson in 'The Grey' (right) use angry or disgusted expressions
Action movies have the angriest looking actors on their posters, followed closely by horror, adventure and fantasy films.
In a similar way, levels of disgust are most regularly seen on posters for action movies.
Contempt is most frequently used on comedy posters such as Adam Sandler's 'Click' or Ben Stiller and Owen