The man seems to be asking how many s's there are in the word "Mississippi", so the woman gives the answer (four). But the man is actually asking how many s's there are in the word "that" (which is none!).
女人以為男人問的是「Mississippi」這個字裡面有多少個s，於是回答了「4個」，但其實他是問「that」這個字中有幾個s，答案是沒有。（「That」中哪有s？）■漫畫&說明︰英國文化協會
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