Susie Susie Susie ... Oh A teacher was reviewing her class's homework assignment. She asked Susie to stand up and tell the class what part of the human body enlarges to seven times its original size when stimulated. Susie stood up, shuffled her feet and said, ""Well, I think I know, but I'm too embarrassed to tell you."" The teacher said, ""Sit down, Susie. Johnny, tell the class what part of the human body enlarges to seven times its size when stimulated."" Johnny said, ""That's easy. The pupil…