The rule of thumb here is that a person should not call a chick whose number he got until three days after he got it. My question is does the rule vary for women that you have class with each week? I got a chick's number this Monday and have class with her every Monday. Tonight would be when I should call, given the "3 day rule" but I am debating whether to do so and set-up a formal date for this weekend or keep it cool until I see her Monday and nonchalantly ask her out to dinner after class. The idea behind that is that she would be more willing to do something that isn't a "formal" date, if you will, at this stage. What do experienced DJ's think about this?