"Get ready for a surprise" makes no sense
Brilliant disguise. Completely believable (though why does it have to be a fat hag, when women are usually physically smaller than men, at least heightwise, and Arnold and his character in this movie are physically MASSIVE?).
However, it doesn't make ANY sense that her vocabulary would be THAT limited. Is "two weeks" the only thing they anticipated they would need an answer for? REALLY?
Think about it; they were able to program the head to say 'Get ready for a surprise!", but they could NOT program the head to say a simple, selectable 'yes' or 'no' or any other similar 'default answers' he could have used for many of the questions.
I mean, WHY can the head say 'Get ready for a surprise', but it CAN'T answer 'yes' or 'no'?
It's like a car that can go 180 mph, but not 40 mph. It doesn't make ANY SENSE!