One day, in class, a pupil stuck his hand up in the air. "Miss, may I go to the toilet?" He asked.
The teacher replied, "No, you know you can't go during lessons."
The pupil protested: "But Miss, I really, really need to go."
"Fine then," said the teacher. "But first, recite the alphabet."
The pupil said, "A B C D E F G, H I J K L M N O. Q R S, T U V, W X, Y and Z. Now may I go to the toilet Miss?"
The teacher hesitated. "What about the P?"
"It's just trickled down my leg, Miss," said the pupil.