Carnage - a domestic play in a movie

It is not often that you can enjoy 80 mins of conversation between 4 people in one apartment - but this time Roman Polanski converts what was a play into a challenging movie. The opening scene of gang warfare along the river in what turns out to be Brooklyn is quite significant - even though you don't realise it at the time. Both parents meet to discuss their sons' behaviour and their discussions represent a panacea of life, opinions, personality and philosophy. At first Jodie Foster and her bathroom salesman husband (John Reilly) seems to be the most politically correct and rational person in the room. In contrast, Kate Winslett plays a very ditzy and superficial investment banker, married to an immoral lawyer working for corrupt pharma (Christopher Waltz). Despite several attempts at exiting, Kate and her husband are drawn back several times - I admit wishing they would just get in the lift and just get out of there! But I seemed to accept the continuing conversation and I was carried along by the changing dynamics and the emergence of the 'real' or underlying personalities... It became clear that Kate was resigned to her workaholic and emotionally ignorant husband's consistent phone chattering - and it was not surprising that he became infantile when she drowned his phone in the flower vase! But it was disappointing to see Jodie's neuroticism emerge beside her husband's repressed bullying gang leader's behaviour. And so I guess the underlying question of whether we ever really 'know' anyone remains...