3. Night of the Living Dead (1968)

"They're coming to get you, Barbara," jokes Johnny to his sister at the beginning of George Romero's classic, which pretty much created the entire genre. Little does Johnny know that they're coming for him too, as he becomes the first zombie attack victim.

Although it has been remade twice (the decent 1990 version and the horrible 2006 debacle in 3D), the original is just as chilling as anything that has come from the genre since. This movie forces you to think about every possible stronghold, weak point, and escape route in your house.