转帖:
Little Johnny returns from school and tells his father he got an "F" in Arithmetic today. 
"Why?" asks his father. 
"The teacher asked, 'How much is 2 x 3?' I said "6". 
"But that's right," said his father. 
"Then she asked me 'How much is 3 x 2?' 
"What's the fucking difference?" asks his father. 
"That's what I said!"