Pair of Normal What?

PARANORMAL: Anything beyond or contrary to the scope of normal scientific understanding. That's rather open to interpretation, don't you think? We think so. In these stories, you'll meet shapechangers and vampires, things that go bump in the night and things that go whoosh in the sky. Some of these and some of those, some of this and some of that. Read, and then ask yourself, "A pair of normal what?"