It happens to all of us: We're walking down the street on our iPhone when suddenly we hear something growling behind us, snarling, we glance back and see… A BLOOD-THIRSTY ZOMBIE! It gives chase. We get scared. Drop our beloved iPhone and run before the damn thing eats us alive! The iPhone hits the ground and the screen shatters. We don't care at this point, though, because there's three flesh-hungry...