Parental Guidance? — Oh, Oh!

A teacher asked little Johnny if he knew the numbers 1 to 10 well. “Yes! Of course! My pop taught me, even more than 10!”
“Good. What comes after three?”
“Four,” answered the boy.

“What comes after six?”
“Very good,” said the teacher. “Your dad did a good job. Now, what comes after ten?” “A jack!”