Little Harry returns from school and says he got an 'F' in arithmetic.

"Why"? asks the father.

"The teacher asked "How much is 2 x 3", so I said 6", replies Harry.

"But that's right" says his father.

"Yeah, but then she asked me, "How much is 3 x 2"

"What's the fuckin' difference?" asks the father.

"That's what I said" replied Harry.