Night of the Living Dead - 1968 film

Every year, Barbara and Johnny go to put flowers on their father's grave. The road is long, the surroundings of the cemetery deserted. Not inclined to pray, Johnny remembers the time when he was a child and when he had fun scaring his sister by repeating in a deep voice: "They're coming to get you, Barbara."
Night is falling. Suddenly a strange man appears. He approaches Barbara then attacks Johnny, who falls and is left for dead. Terrified, Barbara flees and takes refuge in a country house. She finds Ben there, as well as other fugitives. The radio then tells them the terrible news: the dead are attacking the living.