Teacher: "Now Johnny, can you tell me some of your favorite numbers?"
Little Johnny: "541, 29, 623, 188, 769 and 40."
Teacher: "Very good, Johnny, now I would like you to add your favorite numbers together."
Little Johnny: "Uhm, uh... actually, a couple of numbers I really like are 4 and 1."
During dinner, Little Johnny's mother catches him feeding the dog under the table. "Johnny," she says sternly. "You know very well that you're not supposed to feed the dog at the table!"
"I'm sorry, Mom." Johnny replies.
"All is well," his mother replies. "Now, do you know why we have that rule in the house?"
Johnny muses for a moment, then replies, "I guess it's 'cause if the dog doesn't like the food I give him, the food'll get left on the floor and eventually rot."
Little Johnny: "Mom, Dad just backed out of the garage and ran over my bicycle!"
Mom: "Maybe in the future you shouldn't leave it on the front lawn."
Little Johnny's mother is making lunch when Johnny comes in from playing outside, covered in dirt.
"Johnny, you need to clean up for dinner," his mother says, looking at his left hand. "I've never seen a hand so filthy."
"Then you haven't seen this one," Johnny replies, holding up his right hand.