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Luke's Darth Vader vision on Dagobah ("Episode V")
While training with Yoda on the remote swamp planet, Luke encounters a vision of Vader and decapitates him during a lightsaber duel -- only to see his own bloody face staring up from inside the helmet. The slo-mo scene isn't just one of the most intriguing moments in "The Empire Strikes Back," it also contains one of its most grotesque images.