A teacher noticed that a little boy was squirming around at the back of the class, scratching his crotch and not paying attention.
She goes to the back to find out what's up, and the little boy got embarrassed and whispered that he had just been circumcised and he is quite itchy.
The teacher tells him to go to the headmaster's office, to phone his mum, and ask her what he should do about it. He does this and returns to the class, sits down in his seat and suddenly, there's a general commotion at the back of the room.
The teacher again goes to the back of the class, only to find him sitting at his desk with his zip undone and his penis hanging out.
"I thought I told you to phone your mum!" said the teacher.
"I did," replied the young boy, "and she told me that if I stick it out till noon, she would come and pick me up from school!"