My biggest problem is with people who are late and don't understand why it's necessary to call. My experiences make me someone who starts wondering the second someone is late if they've died in a car accident, and while that's totally neurotic, it's still only appropriate to call to say, "Hey, be there in 10."
My wife is like that. I reflexively keep her informed about when I expect to be home or to meet her somewhere, updating if it looks like I'll be late (or early).
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