you know what's supremely annoying? When you're in the middle of telling someone a story and then their cell phone rings. And they "have to take the call." And the call lasts four or five minutes. And you sit around staring blankly, trying to not listen to their conversation and also trying to remember where you were in the story. But as the minutes drag on, you care less and less about what you were going to say. And then they finally get off the phone and they ask "ok, where were we?" And you're all "uh nevermind. I forgot." And then there's an awkward silence.
I'm making a new rule. I will not pick up my phone mid-conversation.