Carnage(2011)
It was a good movie directed by Roman Polanski and starring Kate Winslet and Jodie Foster .. the story is about two couples who have met each other because of a quarrel between their sons in the school and they started the discussion so fair-minded at the first but as the discussion goes through, they start to attack each other by words and as always in Polanski's movies the civilized immorality(as he calls it so) shows up and how we are always pretending to be civilized and fair-minded
it was a good movie but might not be so entertaining, totally I recommend it!