The power of Jonathan's Pinch

David: "Momma! Momma! Jonathan put a hole in my arm."
Momma: "What?"
David: "Jonathan pinched a hole in my arm."
Jonathan: (Laughter) "There is no hole in your arm."
David: "YES, there IS."
[Momma inspects the arm.]
Momma: (stifling laughter) "Oh David, there is a scratch on your arm. Jonathan..."