"Can you tell me one of the most popular use for cowhide?"
"Sure, it holds cows together."
Teacher: "Why does an elephant have a trunk?"
Little Johnny: "Because it doesn't have a glove compartment!"
"Don't be afraid of the dog," said the lady to Little Johnny, who was delivering her groceries.
"You know the old proverb, 'A barking dog never bites?'"
"Yes," replied Little Johnny. "You know the proverb. I know the proverb. But does your dog know the proverb?"
Science teacher: "Does anyone here know what sodium hypobromite is?"
Student: "NaBrO!"