Things They Should Invent: clear communication meter

Sometimes I think I'm communicating perfectly clearly with no room for ambiguity, and my interlocutor doesn't understand what I'm getting at at all. And sometimes someone is telling me something that makes no logical sense whatsoever, but they're acting like what they're saying is perfectly obvious. And sometimes the miscommunication in these cases is so great that the speaker can't even tell what aspect of it is not obvious to the listener. (This isn't a question of misunderstanding the language being spoken, it's a question of the clarity/logic of the message being communicated.)

As a translator and as a human being living in the world, I know intellectually that both parties are responsible for ensuring that communication is clear (assuming both parties are more or less equals - when an adult is talking to a three-year-old, it's obviously the adult's responsibility to understand and make themselves understood). But it's still frustrated, and there's often a part of me mentally screaming at my interlocutor "STOP BEING STUPID!" And if this happens often, it's very easy to feel like I'm the only sensible person in a world full of idiots, when in fact it's quite possible that I'm the idiot.

I wish there was some way to objectively measure who is making more sense and who is at greater fault for the miscommunication. That might make it easier to clear up any miscommunication, and people could get a sense of how often they're the idiot in the conversation. Maybe they could make an iphone app to do this.