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The Giant after believing Hogarth to be dead. Even savvy viewers that knew otherwise got choked up by the Giant grieving for his friend.
If you listen close during that scene, you can hear the Giant whimper, "Hogarth."
Watching the Giant succumb to his defense mechanism can be a Tear Jerker as well. Yes it can be a Crowning Moment of Awesome for some, but it's very much like Sulley scaring Boo; we've gotten so used to this Gentle Giant that seeing him like this is legitimately horrifying, especially since he actually tried to resist his mechanism just a few seconds ago.
The expression on the Giant's face once he snaps out of his rage and goes back to normal.
The deer in the forest and Hogarth's explanation of the concept of death to the Giant.
Hogarth: Things die...It's a part of life. It's bad to kill. But it's not bad to die.
The ending where the Giant is piecing himself back together bit by bit after being blown up is a Tear Jerker of the joyful kind.
This exchange of dialogue:
Annie: Shouldn't we get to a shelter?
Dean: ...it wouldn't matter...
Just the hopelessness and sense of realism in his voice...
The scene after Hogarth nearly gets vaporized by the Giant when they were playing a game and the Giant mistook Hogarth's toy gun for a real weapon, and Dean yells at him, calling him "a big gun that walks." Giant then gets a "My God, What Did I Almost Do?" moment when he sees a bus with a vaporized hole as Dean tells him, "You almost did THAT to Hogarth!"