The Teacher

[druid]

One day when the teacher walked to the blackboard, she noticed
someone had written the word 'PENIS' in tiny letters. She turned around and
scanned the class looking for a guily face. Finding none, she quickly erased
it and began class.
The next day, she went into the room, she noticed in large letters the
word 'PENIS' again; this time written about halfway across the board. Again
she looked around in vain for the culprit, so she proceeded with the day's
lesson.
Every morning for about a week, she went into the classroom and found
the same disgusting word written on the board, each day's larger than
the previous one. Finally one day, she walked in expecting to be greeted
by the same word on the board but instead found the words:
"The more you rub it, the bigger it gets."