Your girlfriend Jane walks up to you, a serious look in her eyes. "Honey," she says, "We've been together for two years now. We share a house. I have something I need to show you. A huge secret. Just... don't freak out." Jane ties her brown hair back into a ponytail. Behind her ear is a leech-like worm thing clamping its sucker onto her skull. Jane touches it with her finger. "You see that? That's the real me, my real body. The human body's just my host. I... I'm an alien."