What if you were having that conversation so loudly that people inside and outside the Starbucks could hear you and when you mentioned a brand's name, they were immediately notified and your conversation was permanently associated with their brand? I mean you literally see this phenomenon in public where people converse too loudly in public and strangers then do end up overhearing and feeling, rightly or not, that they can jump in because a conversation that loud is simply too inviting.