Aside from a handful of horror flicks, the spooky thriller The Box has received the worst CinemaScore grades ever from moviegoers, the Los Angeles Times reported today (Wednesday). The newspaper noted that of the 33 demographic categories measured by the service, The Box got an F in 29 and a D in the other four. CinemaScore founder Ed Mintz said the film scored poorly mostly because of the ending. "I'd love to hear how they thought they were going to get good word-of-mouth from that ending. But that's the reason why the movie got an F," he said. "The public acted in vengeance. They got angry about where the story went, and the grade definitely reflects that anger."