When the teacher entered the class, little Johnny slowly said: "Sir, excuse me, your zipper is open."
So the teacher thanked him and fastened his zipper. He went close to little Johnny and told him: "It would be better to say 'the office door is open'.
Next day when the teacher entered the class, his zipper was open once again.
This time little Johnny shouted "Not only is the office door open, but the teacher is at the door and two small students are beside him!"
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