I agree on the "Sixth Sense" that the last scene made the movie. However, in "Unbreakable", I seem to recall counting three "last scenes," at least in the theatrical version I saw. Or at least three separate scenes that would explain much of what had happened within the rest of the picture.
Maybe I'm being picky, but things like that really spoil it for me.
For me it really made the movie about 'mr. glass', that did not happen until you found out what he had done..