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Nightmare Fuel: Friday the 13th (1980)
The end where after Alice kills Pamela Voorhees, she sails off into the lake on a canoe, and when everything seems peaceful and serene, the decaying child zombie of Jason jumps out of the water and drags her under. She then wakes up in a mental hospital and says "he's still there".
The death of the victims, of course.
Pamela Voorhees chasing Alice throughout the camp.