But you may enjoy it even more after learning a bit more about the vampire trope at the center of director Ryan Coogler’s hit film. In all these examples, and countless others, the invitation rule is a powerful narrative device because it creates a false sense of security. “So why don't you go ahead and invite us in?”Jack O’Connell’s lead vampire still has to obey the rule invitation. Sinners is a vampire movie after all, and that means someone inevitably needs to make a dumb decision that lets the vampires inside. Warner Bros.It’s worth noting that Sinners isn’t the first movie to combine the vampire invitation rule and the club bouncer trope to clever effect.