In the top of the tower of Cirith Ungol just after Sam gives the Ring back to Frodo and offers to help bear the burden, Frodo hallucinates Sam as an orc and speaks ferociously. When his vision clear, Sam is kneeling there, wordless pain and tears in his eyes to see what the Ring is doing to his belove master; and more bittersweet yet for Frodo's realization and pain for having caused Sam the pain. Gets me every time. I wish I could convey it better.
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