Rabbi Goldman surveyed his new Torah class; each semester he made it a point to familiarize himself with the incoming students, so he began at once.
“For my first lecture of the season I will speak of liars. I now ask that those of you who have read the twenty-fifth chapter of our text book to please raise your hands.”
All but two of the students raised their hands.
“Very good! I can see that my opening subject is well taken. There is no twenty-fifth chapter in our text book!”
From The Encyclopedia of Jewish Humor from Biblical Times to the Modern Age, compiled and edited by Henry D. Spalding.