When a synopsis involves a group of American college students setting off on a road trip to an empty forest cabin, instinct tells us that the story will probably be a familiar one. Whether it’s to cannibals, zombies, or unwelcoming spirits, these kids are going to bite it – one after the other – until there’s just one of them left (final death optional). But have you ever stopped to wonder why it has to be that way? Joss Whedon and Drew Goddard have, and luckily for us, they’d like to share.