I've been trained to maintain a skeptical demeanor, but it doesn't take much to break through to my over-enthusiastic inner 5-year-old. Just ask and I'll tell you more than anyone needs to know about paleontology or Superman or possible world semantics (I was an odd kid). People say they like talking to me at parties. As a reformed wallflower, I'm still flattered to get invited in the first place.
I do what I can to be polite, respectful, ethical, rational, and available to the people in my life. We're social animals, after all.