A college professor walks into his class and sees, to his surprise, a drawing of a penis on his chalkboard. He concludes it must be a joke and shrugs it off. He rubs it out and begins to teach.
The next day, he walks in and sees a slightly bigger penis on the board, with bigger balls. Annoyed, he manages to keep calm and rubs it out.
The next day, he walks into class and is enraged to see a HUGE drawing of a penis with HUGE balls on his board. Enraged, he sees some writing next to the picture on the board.
It says: The more you rub it, the bigger it gets!
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