An 8 year old boy comes home and tells his father "Dad, I got detention today at school."

"Why Son?" his father asks.

"Well, what is 4 times 5 Dad?"

"20", his Dad replies.

"What is 5 times 4 Dad?" the son asks.

"What the fuck difference does it make?" says Dad.

"That's exactly what I said and now I got detention!"