Little Johnny returns from school and tells his Dad he got an "F" in Maths 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 f#cking difference?" asks his father.
"That's what I said!"