Ever find yourself in a conversation that you think should have ended some time ago, but you're still hanging in there because you think the other person wants to continue, and you don't want to be rude? What if that person actually wished the conversation were over too, but is sticking around so as not to be rude to you? A new study suggests that this sort of thing might be happening more than you'd think - and that we may all be a lot worse at knowing when to end conversations than you'd think.