JokesMarriage The Teacher Entered The Class. What Follows Next Will Make You Laugh Crazy. 12.4k Views When the teacher entered the class little Jonny slowly said: “Sir excuse me; your zipper is open.” So the teacher thanked him and fastened his zipper. He went near little Jonny and told him: “My dear it would better to say: the office door is open.” The next day when the teacher entered the class, unfortunately, his zipper was again open! Little Jonny loudly shouted: “Not only the office door is open but also the teacher is at the door and two small students are beside him.” See more Previous joke An Elderly Man Jimmy Was Walking Down Main Street. Next joke Two Giraffes Enter A Bar.