4. Marcus Gives John His Heart - Terminator Salvation
The absurdity of Salvation reaches its climax when a wounded John Connor is about to die from heart trouble sustained in the final battle against the T-800. However, Marcus, who is with no subtlety whatsoever said to have a "strong heart" at least a few times throughout the movie, surrenders his life, volunteering his heart to be transplanted into John's. The movie ends with the transplant taking place and John surviving it, but it raises a few logical questions: a) wasn't Kate a vet in the third movie? b) how the hell do you perform a heart transplant in the totally non-sterile post-apocalyptic wasteland and c) you can't just dump random hearts into people.
3. That Unexpectedly Dark (And Awesome) Ending - Terminator 3: Rise Of The Machines
For all of its flaws, T3 ends extremely well with a surprisingly dark, even poetic ending. As John and Kate arrive at Crystal Peak and what they think is Skynet's system core, they realise that it's just a nuclear fallout shelter, and that Skynet has no physical system core: it's software distributed over the Internet and can't be stopped. Furthermore, Kate's father Robert, who directed them to Crystal Peak, sent them there in order to live, and in a closing monologue, John appreciates that Judgment Day was inevitable. The movie ends with 3 billion lives being extinguished as the human resistance begins, and as John says, "the battle has just begun". Even if it completely tramples over T2's tidy ending, it's at least an incredibly ballsy way to close things out, while leaving the door open for sequels.
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