At the first house a woman complained, "I've been a little sick to my
    stomach." The older doctor said, "Well, you've probably been overdoing the
    fresh fruit. Why not cut back on the amount you've been eating and see if
    that does the trick?" As they left the younger man said, "You didn't even
    examine that woman. How did you arrive at your diagnosis so quickly?" "I
    didn't have to. You noticed I dropped my stethoscope on the floor in
    there? When I bent over to pick it up, I noticed a half-dozen banana peels
    in the trash. That was what was probably making her sick."

"Huh," the younger doctor said, "pretty clever. I think I'll try that at
    the next house." Arriving at the next house, they spent several minutes
    talking with a younger woman. She complained that she just didn't have the energy she
    once did. "I'm feeling terribly run down lately." "You've probably been
    doing too much work for the church," the younger doctor told her. "Perhaps
    you should cut back a bit and see if that helps."

As they left, the elder doc said, "Your diagnosis is almost certainly
    correct, but how did you arrive at it?" "Well, just as you did at the
    last house, I dropped my stethoscope and when I bent down to retrieve it,
    I noticed the preacher under the bed."
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