Mr. Henry, the math teacher, enters the classroom. The students are playing around after the bell. They are not in their seats. Mr. Henry decides to teach them a lesson.

He calls, "Ivan, name a two-digit number."

Ivan responds, "56."

Mr. Henry, "Why not 65? Sit down, you have a D minus. Peter, name a two-digit number."

Peter responds, "18."

Mr. Henry responds, "Why not 81? A D minus for you, too. Moishe, name a two-digit number."

Moishe responds "33."

Mr. Henry replies, "Why not.... Moishe! Stop these Jewish tricks at once!"