There is a kind of questions in Persian which is called "obvious-answer question" in this article. This kind of questions has not received much attention by the Iranian linguists or researchers and has not mentioned in the traditional Persian grammar books. Since the answers of these questions have no information and seem redundant, they are not suitable for the formal and especially academic writings. They are mostly used in the spoken and everyday language and in my opinion, are much more culture-dependent, comparing to the other kinds of questions. These questions are nowadays so interesting to the people that some sort of humor has been created according to them, called" pa na pa jokes". These jokes are some kind of retorting jokes in which the answer of the question is so obvious that you may think the joke teller builds on a stupid remark, but in fact in the real life, obvious-answer questions do not look so stupid because they are used in the special contexts and for the special purposes and so they are totally meaningful. In this paper, we study the structure and functions of these questions and the way that "pa na pa jokes" are made in Persian.

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