CELL PHONES how annoying is it to listen to another persons phone conversation?

This will be a good conversation and you will be able to say all the things you have wanted to say to the loud obnoxious people talking on their cell phones in public places. Don't forget the Blue Tooth's out there! we will talk about how obnoxious they are as well. There is a phone etiquette book on cell phone use isn't there? If not help me make one. Let's set the rules tonight on this because as much as I love to use my cell and my Blue Tooth there has to be some rules right?