
Hi First things first: the word "nitwit" is used by one boy against the other, not with reference to Ms Grundy (there is a comma after Grundy - though it's easy to miss it) The woman's name is Ms Geraldine Grundy and she seems to have been a popular character in the cartoon for a number of years On the one hand, she tries to be strict with her students; on the other hand, they admire her for that However, that means they can't understand what she would be like "without a school around her". Hence the joke, when they do see her outside of school Hope this helps to explain, Dave
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