I would have to say some of my ancestors. Then I could get answers to all the questions I have that there is no info about in the records.
Someone else mentioned Bill Maher. I would love to meet him, and pick his brains. The problem with meeting celebrities is that it's usually just a quick hello and handshake. I'd like a conversation.
The only celebrity I've met that I've gotten to actually talk to is Mark Victor Hansen (author of Chicken Soup for the Soul books). I had breakfast with him in Hawaii, and he was so nice. I didn't know who he was until he stood up to go to the buffet, and I read his badge, attached to his belt. When he came back to the table, then I could talk on a different level. He's great.