"I'll make you eat your hair" is the punishment Collin Farrell's character, Steven, threatens his son with right before describing to the kid how he, as a child, once masturbated his drunken father. That's just to give you some idea of how strange this film is. The performances of Farrell and Nicole Kidman are excellent, though purposefully stilted and generally cold, but it's the performance of Barry Keoghan as the family's nemesis, Martin, that is a wonder to watch. Initially appearing harmless, if a bit odd, it becomes soon apparent that this young man has a diabolical score to settle with Steven, the doctor who may have been responsible for a tragedy in Martin's life. This film will undoubtedly divide its audience, but it's tremendously well done.