Who would you invite to dinner?

So... I remember in middle school some teacher asked us this question. I think we could choose three people. And you get to ask them a question or just, you know, get to know eachother.

Some people chose Hitler as one. That's not very smart cuz he's a vegetarian (sp) and the whole dinner would be awkward as you are chowing down on your steak.

Some people chose Ghandi. Again, awkward dinner.

So I suppose I should answer the question. How about... (1) Pierre Fermat and ask him if he really had a proof for Fermat's Last Theorem. (2) JFK's killer and ask him what his name was. (3) Brian Greene and shoot the breeze.

Who would you pick?