On July 21, film fans will have a big choice to make. Do you go to the theater to see Greta Gerwig’s “Barbie” or Christopher Nolan’s “Oppenheimer?” Well, adding a new wrinkle to that is the fact that Lionsgate is releasing a horror movie, “Cobweb,” to counter-program the two big releases. READ MORE: Summer 2023 Movie Preview: 52 Must-See Films To Watch As seen in the trailer for “Cobweb,” the film follows the story of a young boy who hears a tap-tap-tap from inside his bedroom wall each night.