Navidson's ending (which ends in marriage, the survivors returning to normal, and the house sealed off), and the very beginning before they discover the house.
And what about Karen overcoming her fear of the dark and rescuing Navidson?
Even if it makes it worse the whole Pelafina/Johnny mother-son relationship had its moments too. Specially when Johnny opens the locket. And the Story of the Mother is heartwarming in a tragic, melancholic way.
During the evacuation, a drunk Tom starts to recite the old "the floor is a drunk's best friend" joke, and Navidson finishes it for him, with "because it's always there for you". Tom then compares Navy to the floor. Aww.