The three hardest questions to answer at family parties while in graduate school:
Well-meaning person: So, what classes are you taking?
The honest grad student answer (at least in the sciences) is sorry, I don't really take many classes, or infact, any, after my second year. In any case the majority of my time is spent working in the lab and teaching, which is why I get "paid" to "go to school."
Well-meaning person: Is your plan to become a professor after this?
The honest grad student answer: After this, I expect that I'll never want to see an undergrad again.
Well-meaning person: So, when do you graduate?
The honest grad student answer: Walks away, bitterly weeping.