According to the Rule of 10, No one is allowed to call someone after 10pm or before 10am unless it is absolutely Important.
Bob: uhhg, hello?
John: hey. what's up?
Bob: Why the hell did you call me, it's... 2am...
John: Oh, I just got out of the club, I was seeing what you were doing.
Bob: Did you forget the Rule Of 10?