I like living in my own world. I'm prone to long stretches of introspection and fantasy, followed by periods of intense activity. It takes a very interesting situation to get me out of that, and the definition of interesting varies with time.
I'm curious almost all the time, about everything. I've spent hours reading or discussing almost any subject I can think of, and when I don't know enough to talk about something I'll ask questions and listen. I don't promise I'll remember most of it afterwards though.
I'm also the guy you can count on for a sarcastic comment at any time. I don't guarantee they'll be appropriate though.