Smart

Little Johnny comes home from school at the end of a term with his report card. The report card has all D's and F's. His parents start lecturing him, and Johnny explains that everyone in his class did poorly, not just him.

"But what about David down the street?" they said. "HE brought home all A's and B's."

"Well, David is different," he retorted.

"How so?" his father asked.

"Cuz his parents are smart!"