"Getting Bigger" joke

As the teacher walked up to the blackboad, she noticed that someone had written the word 'penis' in very tiny letters. She turned around and scanned the room, hoping to find a guilty face. Finding none, she promptly erased the word and proceeded with her lesson.
The next day, when she entered the room, she saw the word 'penis' was again written on the board, this time in larger letters. Again she turned around, searching for the possible culprit, but found no one. Easing it from the board, she began the day's lesson.
Each morning, for about a week, she entered the classroom and found the same word written on the board and each time the letters were larger.
Finally, she walked in one day, fully expecting to find the same word on the board. Instead, she was greeted by a message that said, "The more you rub it, the bigger it gets."

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