A teacher was supervising a class of small children when she noticed a boy at the back of the class messing about with his trousers and scratching a lot "down there".
"Whatever is the matter Johnny?"
'I've just been circumcised and it itches and hurts!'
"Well, I think you had better go the office and phone home and ask her for some advice"
So, off he goes and phones home then comes back into class.
There's a kerfuffle at the back of the class and Johnny has his willy poking out of his trousers!
The teacher shouts "Johnny-please put that away!"
'But Miss, my mum said if I could stick it out 'til lunchtime she'll come and pick me up and take me home!'