A pastor went to a church to preach one morning. When he reached the church, he asked "Church, do you know what I'm going to preach today?" The church answered no. "Then, it is pointless for me to preach to you." And he walked out the church. The next Sunday, the pastor asked the same question. This time the members learnt their lesson and answered yes. "Then, it is pointless for me to preach to you, since you already know what I am going to preach." And he walked out of the church. The following Sunday, the congregation decided that should the pastor ask the similar question, one side will say yes, and the other side will say no. True enough, the pastor asked the question, and one side said yes while the other side said no. "Then, can I ask this side of the congregration, who said yes, to preach to the other side of the congregation?" And finished saying, he walked out of the church.