What is this movie? info in descrip?

a movie where there is a couple, who goes on a vacation, wherein they hear news that there is a couple that murdered some people. then after a few scenes they meet another couple which they suspect to be the criminal couple, but in the end its actually mindfck, because the 1st couple is actually the criminals... show more a movie where there is a couple, who goes on a vacation, wherein they hear news that there is a couple that murdered some people. then after a few scenes they meet another couple which they suspect to be the criminal couple, but in the end its actually mindfck, because the 1st couple is actually the criminals because they do drugs, and the other girl only figures it out because of a picture in the camera, and they fight off and the good man wins because he has steel on his head or back because of an old operation/surgery done to him
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