Middle age crisis in the American upper-class mentality The long-married middle aged couple Beth and Don look great together, sound supportive and caring; even their son Elliot thinks they behave like a romantic couple who have just fallen in love. Yet, they, quite unwittingly, act it all out telling each other those white lies that they like each other's gifts, each other's work, taste etc. Just not to hurt each other's feelings. Interestingly, the idea of the movie is not to reveal the truth, or, to be precise, their lies to each other and us the viewers, but to show that this is a built-in part of the culture so it just can't stop existing. At some point, the partners open up to each other and talk honestly, own up to lying, explain why and admit their feelings were hurt, and it looks as if from now on, it's only truth and nothing but truth. However, what we see next proves they don't really want to change, they'll keep lying and they'll feel hurt when they find out about a new lie. And their feelings will still not be hurt when they hear a lie. And their feelings will be terribly hurt if they hear the truth.
Gives some food for thought and offers a choice to make.