Runners scare me. Not joggers of course. I mean fast zombies. As a kid I was already scared by the Romero type shamblers and shufflers but once I caught a glimpse of the runners in Return of the Living Dead I was terrified. These days runners seem to have taken over for their shear fear factor. From movies like 28 Days Later to the remake of Dawn of the Dead, fast zombies have become the norm. Fresh ones might look like regular people and in some cases it could be hard to tell a blood covered soon-to-be victim running for their lives from a blood thirsty horror running for your life.
They are mostly terrifying because of how animalistic they are. All the human doubts, questions, hesitations and fears are completely removed. They will jump through windows, run relentlessly and tear themselves apart without slowing or hesitating to get at you. More than simple undead ghouls, they are humans at their worst, and in groups are a wild mob force that will tear you limb from limb. They aren’t content to slowly shamble and bump against a boarded up farm house, they will tear the house and themselves apart to get inside.
Fortunately though, they aren’t any stronger than regular humans and strong barricades that hold out humans should also hold back the undead.