I know there was a thread about cell phone conversations and how annoying they are...At one point, someone couldn't understand what's the difference between someone talking to someone (who was physically there) at normal volume and someone who was talking at the same volume to someone on a cell phone. I couldn't exactly answer what the difference was, but I KNEW that the cell phone conversation was definitely more annoying to me. Anyways, it's obvious when someone is talking loudly...but I just heard some information that makes sense as to why 'normal' volumed cell phone conversations are SO annoying. They say that our brains expect to hear both sides of a conversation. When we don't hear the other side of the conversation, our brains tend to concentrate more on the conversation and it actually frustrate us. They said they did research with conversations (with two people in the same room) and found that if one of the people talked softly (to the point that the observer couldn't hear them), they found that the observer would get frustrated.