The scene where Dennis admits to the therapist that, yes, he's Dennis?
His eyes well with tears...he's realizing he can't keep up the ruse...then finally opens up about about how him and Patricia have been ridiculed by the others and don't deserve it. How they're all struggling and the others need to admit it?
I played that a couple times over, just thought it was one heck of a well-acted scene. It really sold the idea that these are definitely distinct, different people within the same person...each using their own methods to protect Kevin and all of them doing the best that they knew how. I don't know...this scene just raised my neck-hair some. It seemed...real, I guess.
Its moments like these that IMO, you can't deny that Shamayalan (sp) has talent. As much as he is or isn't able to tap into it, at least the guy writes stuff that you won't find in many Hollywood blockbusters. This is one of those rare cinematic moments that feels special...sticks with you some.