The dentist was striving to extract a tooth, but every time he got ready to proceed, the patient clamped his jaws. At last, he took his assistant aside and told her at the very moment he poised the forceps, to give the patient's balls a vicious pinch.
The pinch was administered, the nervous patient's mouth flew open, and the tooth was easily removed.
"Didn't hurt, did it?" asked the dentist.
"Not too much," replied the patient, "but who would have thought the root went that deep?!"