NEW YORK (AP) — After spending the night shooting the most devastating scene in "Manchester by the Sea" — a scene in which, Casey Affleck's character, clutching a bag of groceries, stands before a tragedy that haunts him throughout the film — Affleck tripped and felt a shooting pain run up his back. Writer-director Kenneth Lonergan, a veteran back-thrower, quickly yelled for Affleck to move around to keep the muscles from seizing up.Read more on NewsOK.com