Smile, be respectful, and thank them for the opportunity. Good manners always makes a good first impression. Don't wear anything with a logo on it so they know that you know.
My cable TV acting debut will be coming out December-ish. I'll post it for the proper public humiliation as I played a murdering husband in a reenactment. Good times and very therapeutic.
Thanks guys. I don't need to worry about wearing logo t-shirts, it says I have to wear my best business suit. Now I'm curious of what kind of scene this is!