- Watching the Giant struggle in pain as the electrical wires he had been trying to eat at the power plant electrocute him. It's the first indication that this isn't just a monster, but a sentient being with feelings, which is why Hogarth goes back to save it.
- The Giant's Heroic Sacrifice: "You...stay. I...go. No following."
- "Superman..." Who knew that Vin Diesel could reduce grown men to tears with a single word? Kal-El himself would be honored.
- The way Hogarth whispers "I love you," as The Giant takes off.
- Hogarth tearfully clinging to the Giant's finger as he pulls it away.
- The utter exhaustion in General Rogard's voice after the giant's sacrifice is tear-jerking in its own way as well.
- "Souls don't die..."
- The Giant after believing Hogarth to be dead. Even savvy viewers that knew otherwise got choked up by the Giant grieving for his friend. Especially when he starts trembling and buries his face in his hands.
- If you listen close during that scene, you can hear the Giant whimper, "Hogarth."
- The way he nudges his unresponsive body, just like the deer, and starts crying as he puts two and two together.
- Watching the Giant succumb to his defense mechanism that he so desperately wants to defy, especially after almost killing Hogarth with it. It's both tragic and horrifying to see this Gentle Giant suddenly turn into the monster he doesn't want to be.
- The Giant hyperventilating like a frightened child 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.
- 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!"
- "I- I not gun."
- Later echoed for a Awesome Moment.
- "I- I not gun."
- The scene where the Giant approaches the dead deer, and learns about the concept of death for the first time. Even more sad considering what happens to him later on.
- What happens when you combine the Tear Jerker endings of Iron Giant and Wreck-It Ralph? Cue the waterworks.
- Ted Hughes, author of the original novel who absolutely loved the film, died mere months before it was completed.