Build a movie plot around this: Why is the group's plan ruined? Ben falls out of the truck bed
Siblings Barbara and Johnnie visit their mother's grave in a remote Pennsylvania cemetery. During their visit, Barbara is attacked by a zombie. Her brother comes to her defense but is killed. Barbara flees the cemetery and discovers what at first seems to be an abandoned farmhouse. She seeks shelter there, only to find another pack of zombies. Shortly after, a man named Ben arrives, and the two clear the house of the dead and begin the process of barricading the doors and windows.They discover other survivors who have been hiding in the cellar of the house: Harry Cooper, a loud and argumentative husband; his wife Helen; their daughter Sarah, who was bitten by a zombie and has fallen seriously ill; teenager Tom Bitner and his girlfriend Judy Rose Larson. The group is divided over what their next course of action should be. Harry believes everyone should retreat to the cellar and barricade the door to wait for the authorities. Ben thinks the cellar is a "death trap" and that they would be better served fortifying the house, which at least has alternate escape routes, and Barbara suggests that the group should simply leave the house on foot after she notices the zombies' limited mobility. An argument between Ben and Harry leaves the Coopers in the basement to tend to their ailing daughter, and the remaining members remain upstairs to continue their work reinforcing the doors and windows. The loud construction attracts even more zombies to the farmhouse, soon collecting a large mob.The group devises a plan to escape using Ben's truck, which is out of fuel, by refueling at a locked gas pump a couple hundred yards away. A search of the corpse who lived in the farmhouse produces an unknown set of keys. Judy Rose, Tom, and Ben proceed up the hill toward the gas pump, but their plan begins to unravel when Ben falls from the bed of the truck and is left to defend himself. To their horror, the key to the gas pump is not among the bunch they brought with them. When Tom shoots the lock off, the leaking gasoline is...