But coming home for supper is no proof. Cases of monstrous possession don't always leave immediately visible traces, as I'm sure you know. A person is bitten and appears to walk away. Signs of strain are dismissed as something ordinary, like a cold, or, indeed, as jet lag. And then, hours later, the monster inside comes to the fore. Human eyes turn reptilian, nails turn into rending claws... Screams ensue... and thus the Dinosaur Apocalypse commences.