with grad school, you'll certainly have your hands full. Remember if your grad professor starts harping at you about "things aren't going to be THIS easy in the REAL WORLD", to ask him what his salary is and compare it to that of your college part time job... then point out that you pay his salary, that's the real world.
In the past 4 years of college, I've refused to respond to my professors unless they call me by "Sir" or "Mr. lastname". If they get snippy about it, I tell them I'll also accept "Sire" and "M'Lord".