Author Seth Grahame-Smith has dined out on the winning combination of stitching together two incongruous things, one high-brow, one low, and letting the concept do the heavy lifting. "Abraham Lincoln: Vampire Hunter" gave readers, and then movie-going audiences, an axe-twirling Honest Abe. His other literary soft-serve swirl hits theaters this weekend, in "Pride and Prejudice and Zombies." The cheeky adaptations offer a chuckle at the title, but there's not much else to sink your teeth into.