I saw this one in theatres in the year it's been released, couldn't watch it never again because i found it so cruel that goes beyond if is or not a good movie.
Ok OBVIOUSLY then SPOILERS AHEAD!I AM REVEALING THE END OF A MOVIE THAT PRACTICALLY EVOLVES TO THAT VERY POINT!:
What i remember:
Iron's son eventually walks in a room were his father and his wife are passionately fornicating. is exactly that scene in the poster where the two of them are closing each others eyes as an erotic game, so they go ooooon for quite a while before realizing that the poor guy is right there.
They then i believe i remember try to utter some word to the son but he is in an enormous state of shock and let me add that "it's not what it seems" wouldn't have helped much because dude, they where like REDEFINING the act of fock.
So the guy starts walking backwards trips over the bar of the stairs (don't know th exact word in english) and falls several stories to his death.
The ending of the movie pictures Iron's secluded in some eastern europe third world country eating oranges he just bought in a big white empty room only decorated by a gigantic wall paper of a photography of his son him and their wife/lover.

If you have Netflix, I would highly recommend checking this out via Instant Watch on your pc to finish the film. Hope this helps!