I can see devising responses to set questions, but if it plays out in your head to the point where you're actually surprised, I... Well, I just don't get it. I don't surprise that easily. Buttons, even when it's someone that exists outside of my own head, I'd like to think I'd have some indication of their actions beforehand. Only if I had some past knowledge of their character. If I didn't, though, I don't see why I'd be interacting with them on a level more advanced than "Yeah, I'll have the sweet & sour chicken. Wait, does that come with an egg roll? Ok, thanks."
Speaking of which, I just remembered I have an unopened fortune cookie in the kitchen, and if it calls my name any harder, it'll risk permanent, irreparable damage to its airways and vocal cords. I'd better go help the little guy out... and into my stomach.