The doctor's pen paused over the chart on his desk, "This is your third set of teeth, I believe?" His patient nodded, "That's right, Doctor. But they were pretty slow coming in this time." The doctor looked up quizzically, "Is that the only reason you think you might need a booster shot?" "Oh, no ... of course not!" The man leaned forward and placed one hand, palm up, on the desk. "Last year I had an accident ... stupid ... lost a thumb." He... more...