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Tear Jerker: The Chronicles of Narnia
The ending of 'The Silver Chair' par excellence. Caspian, who we last saw as a vital, energetic young man deeply in love, dies in his son's arms after losing all hope of his return. All the characters we knew and fell in love with like Trumpkin are ancient and decrepit and clearly do not recognise the clearly upset Eustace.
Of course, there is a little post death scene where we see Caspian rejuvenated post-mortem and acting as a Bully Hunter to Jill's bullies, but that doesn't do much to blunt the edge of the scene.