By Brandy McDonnellA version of this story appears in the Sunday Life section of The Oklahoman.Horror theater: Oklahoma City Theatre Company opening 20th season with 'Night of the Living Dead'Richie Rayfield puts an eerie rasp into his voice as he utters one of the most familiar lines in horror-movie history.“They’re coming to get you, Barbara,” the actor intones ominously.“Oh, that’s creepy,” says director Kory Kight-Pagala, listening intently as Rayfield, playing the role of Johnny, teases Corrynn Englerth, playing Johnny's sister Barbara as the siblings make a fateful visit to a country graveyard.Although they were participating in the first read-through for Oklahoma City Theatre Company’s new production of “Night of the Living Dead,” the terrifying thrills of George A.