也来个,英文的:
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Ten  Times
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The 6th grade science teacher,  Mrs. Parks, asked her class, "Which human body part increases to 10 times  its size when stimulated?" No one answered until little Mary stood up,  angry, and said, "You should not be asking 6th graders a question like that!  I'm going to tell my parents, and they will go and tell the principal, who  will then fire you!" 
With a sneer on her face, she then sat back down.  Mrs. Parks ignored her and asked the question again, "Which body part  increases to 10 times its size when stimulated?" 
Little Mary's mouth  fell open; then she said to those around her, "Boy, is she gonna get in big  trouble!" 
The teacher continued to ignore her and said to the class,  "Anybody?" Finally, Billy stood up, looked around nervously and said, "The  body part that increases 10 times its size when stimulated is the pupil of  the eye."
Mrs. Parks said, "Very good, Billy," then turned to Mary and  continued. "As for you, young lady, I have three things to say: Number 1:  You have a dirty mind; Number 2: You didn't read your homework; and Number  3: One day you are going to be very, very disappointed.