A teacher notices that a little boy at the back of the class is squirming around, scratching his crotch and not paying attention. She goes back to find out what's up. He's quite embarrassed and whispers that he has just recently been circumcised and he's quite itchy. The teacher has him go down to the Principal's office to phone his mum, and ask her what he should do about it. He does this, returns to the class, sits down in his seat and suddenly, there's a general commotion at the back of the room. Back down she goes, only to find him sitting at his desk with his willy hanging out.
"I thought I told you to call your mum," she says.
"I did," he says, "and she told me that if I could stick it out till lunchtime she'd come and pick me up from school."