Every time the dentist tried to extract his patient’s tooth, the man clamped his jaws shut. Finally, he took his assistant aside and told her, “Look, when I’m ready, I’ll give you a signal and you pinch his balls–hard! ” He did, she did, the nervous patient’s mouth flew open, and the tooth was easily extracted. “Now, that didn’t hurt much, did it?” asked the dentist. “No, not much,” replied the patient, “but who’d have thought the root went so deep?!”